A farmer has begun using new chemical to help increase the productivity of her tomato plants. The farmer applied increasing concentration of the chemical and recorded the results in the data chart below. Identify the independent, dependent and control variables in this investigation.

Independent variable: the concentrations of the chemical product used.

Dependent variable: the productivity rate of tomato plants.

Control variable: irrigation, intensity of sunlight, number of seeds, tomato plants, number of tomato plants, tomato species.

Explanation:

The independent variable is one that presents an element that stimulates the visualization of a result and that acts on the dependent variable influencing it to behave in a certain way that will be evaluated for the formulation of the results. In the text above, we can see that the concentrations of the chemical product have the ability to influence the productivity of the tomato, therefore, the concentrations of the product are the independent variables.

Dependent variables, on the other hand, are those that do not provide influence, but are influenced. In the text above, we can see that the productivity of the tomato is influenced by the concentrations of the chemical product, therefore, the productivity of the tomato is the dependent variable.

The control variables are all the experimental elements that remain the same, without changes throughout the experiment. In the case of the experiment quote: irrigation, intensity of sunlight, number of seeds, tomato plants, number of tomato plants, tomato species.

Thus question lacks a picture or option, but nevertheless:

Answer:

There are 3 types of friction:1) Static friction - when you apply force and the object does not move.2) Sliding friction - when the surface if the object moves on other.3) Rolling friction - when any wheel or ball moves on any surface rolling friction is applied. it is very less than sliding friction.

Answer:

The article states that the Incas developed knowledge of farming in the Andes region over the course of 11,000 years. This information shows that they refined their farming practices over time. The use of gravel, terraces, and canals allowed the Incas to adapt farming to the difficult terrain.

Answer:

When birds are hungry, they will peck unripened fruit. Also, if there is no other fruit around, the birds might go after unripened fruit. Heavy bird pecking can be used as an indicator that it's ready to start harvesting.

Birds need food to eat, and plants need to disperse their seeds. Fruit-eating animals are called frugivores, and birds are the most important frugivores of all. More than 300 trees, shrubs, and vines in North America have small fruits that depend on birds for seed dispersal.

b

Explanation:

B. The most dairy farms are located in between the Mid-West and Northeastern part of the United States.

C. One spatial pattern that can be identified is in Pennsylvania where there is a huge black dot showing clustered the dairy farms are. (Answers may vary)

Explanation:

Answer :(

Explanation:

if there was A B C D  as answer choices i would be happyily to answer

1. Which limiting factor(s) in this lab simulation are biotic?

Limiting factor is resource/condition that could limit the growth or the population of an organism in the ecosystem. Some factor could be deleterious(like predator) and reduce the population while other could be advantageous(like food) and increase the population. The biotic factor consist of living things.

The biotic factor in this simulation would be alligator and the mosquito.

2. Which limiting factor(s) in this lab simulation are abiotic?

Abiotic factor  consist of nonliving things. The non-living factor in this scenario would be the pollution. Increased pollution could damage all the biotic factor and might limit them. The damage might not be equal as some organism could be more sensitive to the pollution than the other.

3. Which limiting factor impacted the cricket frog population the most? Use evidence to support your answer.

I would say that the predator/alligator is limiting factor that impacted the cricket frog population the most. If you compare the condition of simulation 1 and simulation 2, alligator population is the one that undergo highest change. The population increased by 40,000 in simulation 1 and decreased by 35,000 in simulation 2.

4. Which limiting factor impacted the cricket frog population the least? Use evidence to support your answer.

I think the pollution is the limiting factor impacted the cricket frog population the least. The changes of the pollution number is least when compared to other factor. It doesn't change in simulation 1. The pollution decreased by 15,000 in simulation 2 while the alligator decreased by 35,000 and the mosquito increased by 35,000

5. Mosquitoes can carry and transmit disease to animals and humans. Explain how the cricket frog plays an important role in limiting the spread of mosquito-borne illnesses like West Nile virus and malaria.

The frog predate the mosquito, so the population of frog will decrease the population of the mosquito. The mosquito borne illness is transmitted by the mosquito that contact the pathogens. If the population of mosquito decreased, there will be less mosquito that contact the pathogens. There will be less mosquito that transmit the disease too.

6. Predict the long-term effects of these limiting factors on the cricket frog population in the pond ecosystem.

Increase in predator population will decrease the population of food, and if the food start to decline the predator population will be decreased. Their interaction will prevent the population of one factor to become too big.

In long term, these factors will achieve a stable range. Unless there is a new limiting factor that cause changes in their interaction, the population should be kept at the stable range.