Why are organisms classified?
to determine why organisms reproduce
to determine what characteristics future organisms will have
to determine how closely related organisms are to each other
to determine the age of an individual organism

The correct answers are as follows:
1. D.
Linnaeus was the scientist who developed the modern system of giving names to living organisms, this naming system is called binomial nomenclature. During  the time that this naming system was developed, scientists have not known anything about micro organisms, thus, Linnaeus divided the living organisms in to just two kingdoms, that is, plants and animal kingdom. It was later after the development of the microscope that scientists become aware of microbes. 
2. D.
Living organisms are divided into seven categories, which are: kingdom, phylum, class, order, family, genus and species. The kingdom is the highest biological organisation and it contains the largest number of living organisms. The next level is phylum. The phylum category has many living organisms more than the levels that are below it. The species level has the least amount of living organisms.
3. B.
Before the advent of DNA sequencing, scientists typically classify animals based on similarity in their physical appearances. But, nowadays, the development of DNA sequencing has made it possible for scientists to compare animal on the basis of similarity in their genetic make up, due to the fact that related animals will be genetically identical.
4. C.
Viruses are peculiar micro organisms. Virus are considered to be non living things when they are outside of living cells. Outside the living cells viruses have all the properties of non living things. But, immediately a virus gets an entrance into a living cell, it becomes a living thing and start using the biochemical mechanisms of the host to survive and to multiply. Because of this dual nature, virus was not recognized in Linnaean taxonomy.
5. D.
The members of the domain Archaea do not have nucleus in their cells. All prokaryotes generally do not have true nucleus in their cells. The member of the domain eukaryota on the other hand have true nucleus in their cells. We are told in the question that the two organisms produce their young ones by laying egg, this implies that both organisms are possibly from the animal kingdom.
6. A.
Prokaryotes are divided into two classes: bacteria and archaea. The two classes has some basic differences between them,the difference include the folowing:
a. Bacteria cell wall is composed of peptidoglycan which is absent in the archaea cell wall.
b. Bacterial has only one ribosomal RNA polymerase while archaea has three ribosomal RNA polymerase. These RNA are different from one another.
7. B.
Eukaryotes typically reproduce by means of sexual reproduction. Sexual reproduction involves donation of reproductive cells by the female and the male that are involved in the production process. A reproductive process that is similar to sexual reproduction in bacteria and archaea is conjugation. Conjugation involves the transfer of genetic material by mean of direct contact. It is a sexual mode in which sexually distinct cells are brought in contact with each other.
8. D.
Antibiotic resistance is said to occur, when an antibiotic drug can no longer kill or control the growth of bacteria as it has been doing before. When antibiotics are used, the bacterial that can resist the action of the antibiotic survive while the other ones are wiped out. This result in the natural selection of the bacterial strain that can resist the antibiotic drugs. Bacterial developed resistance through many mechanisms, these include genetic mutation and acquisition of resistance from other bacteria.
9. D.
Endocytosis is the process by which some unicellular organisms such as Amoeba move food molecules into their cells. Amoeba can not produce its own food, it therefore feed on already prepared food molecules. It transport the food molecules into its cell by enclosing and engulfing it. Red algae on the other hand are plants which can photosynthesize, that is, they can produce their own food by using the energy from the sun.
10. C.
Mold grow in the presence of moisture, they need moisture to survive and to reproduce. That is why they are found in moist places. The best thing to do in this instance is to dry out the moisture in the moist place. This will automatically leads to the death of the molds because they will be deprived of sustenance.

The correct answers are as follows:
1. D.
Linnaeus was the scientist who developed the modern system of giving names to living organisms, this naming system is called binomial nomenclature. During  the time that this naming system was developed, scientists have not known anything about micro organisms, thus, Linnaeus divided the living organisms in to just two kingdoms, that is, plants and animal kingdom. It was later after the development of the microscope that scientists become aware of microbes. 
2. D.
Living organisms are divided into seven categories, which are: kingdom, phylum, class, order, family, genus and species. The kingdom is the highest biological organisation and it contains the largest number of living organisms. The next level is phylum. The phylum category has many living organisms more than the levels that are below it. The species level has the least amount of living organisms.
3. B.
Before the advent of DNA sequencing, scientists typically classify animals based on similarity in their physical appearances. But, nowadays, the development of DNA sequencing has made it possible for scientists to compare animal on the basis of similarity in their genetic make up, due to the fact that related animals will be genetically identical.
4. C.
Viruses are peculiar micro organisms. Virus are considered to be non living things when they are outside of living cells. Outside the living cells viruses have all the properties of non living things. But, immediately a virus gets an entrance into a living cell, it becomes a living thing and start using the biochemical mechanisms of the host to survive and to multiply. Because of this dual nature, virus was not recognized in Linnaean taxonomy.
5. D.
The members of the domain Archaea do not have nucleus in their cells. All prokaryotes generally do not have true nucleus in their cells. The member of the domain eukaryota on the other hand have true nucleus in their cells. We are told in the question that the two organisms produce their young ones by laying egg, this implies that both organisms are possibly from the animal kingdom.
6. A.
Prokaryotes are divided into two classes: bacteria and archaea. The two classes has some basic differences between them,the difference include the folowing:
a. Bacteria cell wall is composed of peptidoglycan which is absent in the archaea cell wall.
b. Bacterial has only one ribosomal RNA polymerase while archaea has three ribosomal RNA polymerase. These RNA are different from one another.
7. B.
Eukaryotes typically reproduce by means of sexual reproduction. Sexual reproduction involves donation of reproductive cells by the female and the male that are involved in the production process. A reproductive process that is similar to sexual reproduction in bacteria and archaea is conjugation. Conjugation involves the transfer of genetic material by mean of direct contact. It is a sexual mode in which sexually distinct cells are brought in contact with each other.
8. D.
Antibiotic resistance is said to occur, when an antibiotic drug can no longer kill or control the growth of bacteria as it has been doing before. When antibiotics are used, the bacterial that can resist the action of the antibiotic survive while the other ones are wiped out. This result in the natural selection of the bacterial strain that can resist the antibiotic drugs. Bacterial developed resistance through many mechanisms, these include genetic mutation and acquisition of resistance from other bacteria.
9. D.
Endocytosis is the process by which some unicellular organisms such as Amoeba move food molecules into their cells. Amoeba can not produce its own food, it therefore feed on already prepared food molecules. It transport the food molecules into its cell by enclosing and engulfing it. Red algae on the other hand are plants which can photosynthesize, that is, they can produce their own food by using the energy from the sun.
10. C.
Mold grow in the presence of moisture, they need moisture to survive and to reproduce. That is why they are found in moist places. The best thing to do in this instance is to dry out the moisture in the moist place. This will automatically leads to the death of the molds because they will be deprived of sustenance.

1.The correct answer is D
Since the time of Linnaeus, the classification of organisms into kingdom has significantly changed. Fungi have been classified as a separate kingdom (they have been classified under plants before) and the development of microscopy has enabled scientist to study microscopic organisms and classify them into the Protista and Monera kingdoms.
 
2.The correct answer is D
The phylum is one of the highest ranks of classification, right under the rank of kingdom, so it contains a great number of species. For example, the phylum of Arthropoda contains all the insect, spider, crustacean and millipede species.

3.The correct answer is B
Before the methods of genetics and molecular biology research were developed, species were classified only based on their physical appearance. But now, we can determine how closely related species are by their genes as well. This solves the problem of species that have developed convergent traits as a response to similar environments, but that, in fact, are not genetically similar.

4.The correct answer is C
The classification of viruses has always been a difficult question for scientists. Viruses have their own genetic material enclosed in a protein coat, but they can not reproduce on their own since they need the metabolism and the genetic machinery of other cells to survive.

5.The correct answer is D
The two species are definitely members of the Eukarya domain because they have nuclei. All of the other domains, Bacteria, and Archaea lack all organelles including the nuclei. If both of the species produce eggs, they may be members of the animal kingdom.
6. The correct answer is A
Even though both bacteria and archaea are single-celled prokaryotes the differences between them are great. Their cell walls and cell membranes are built from different lipids and the enzymes that have a role in the central dogma differ significantly.

7.the correct answer is B
Sexual reproduction in eukaryotes has a purpose of exchanging the genetic material between two individuals. The process of conjugation in bacteria is very similar to sexual reproduction, but there are no specialized sex cells and the cells do not form haploid cells through meiosis.

8. The correct answer is D
Natural selection has filtered the population of bacteria. Only the individuals resistant to the antibiotic have managed to survive and leave offspring, producing a population of bacteria that is solely consisted of antibiotic-resistant individuals.

9. The correct answer is D
Red algae are autotrophic organisms. This means that they are producers of food, in this case, they can produce sugars trough conversion of sunlight in the chloroplasts. The amoeba must consume other organisms or organic particles to survive, and the only way for it to do it is through the process of endocytosis since they lack mouths.

10. The correct answer is B
Molds are fungi that are dependant on moisture. They are not photosynthetic and they lack flagella, so the most efficient way to eradicate molds would be to dry out the area and the lack of moisture will cause the disappearance of the mold.

Answer: b. Fiona is correct because the diagram shows two individual simple machines.

Explanation:
A mechanical device using which we can change the direction or magnitude of force applied is known as simple machine.
For example, in the given diagram there are two individual simple machines.
The machine helps in changing the direction or magnitude of force applied by the man. As a result, it becomes easy for him to carry different things easily from one place to another.
Thus, we can conclude that the statement Fiona is correct because the diagram shows two individual simple machines, is correct.

Answer: 25 g
Explanation: Given:
Original amount (N₀) = 100 g
Number of half-lives (n) = 11460/5730 = 2
Amount remaining (N) = ?
N = 1/2ⁿ × N₀
N = 1/2^2 × 100
N = 0.25 × 100
N = 25 g

Answer: 7.8125 g
Explanation: Given:
Original amount (N₀) = 500 g
Number of half-lives (n) = 9612/1602 = 6
Amount remaining (N) = ?
N = 1/2ⁿ × N₀
N = 1/2^6 × 500
N = 0.015625 × 500
N = 7.8125 g