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.

If it's an open question, then 

Answer:

When it comes to areas that humanity does not affect in terms of vegetation, colder areas such the Tundra come to mind.

The Tundra is known for:

- Very cold climates

- Low number of animals and plants

- Limited sunlight

As a result of the cold weather and the limited number of plants and animals in the tundra, humans generally avoid this environment which ensures that there is little effect of humans on natural vegetation patterns.

In conclusion, tundra areas do not see a lot of human influence on vegetation.

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:

More refugees fled Southeast Asia when Vietnam invaded Cambodia in 1979 to overthrow the murderous regime of Pol Pot. Thousands of refugees from that unhappy land began to escape over the border into neighboring Thailand.

Also the majority of Vietnamese came to Victoria after the Communist government took over their homeland at the end of the Vietnam War. Those already in Australia were offered permanent residence, and refugees began to be admitted through resettlement camps based in South East Asia.
 

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:

Quito (B)

Explanation:

The valley of Guayllabamba River where Quito lies is flanked by volcanoes, some of them snow-capped, and visible from the city on a clear day. Quito is the closest capital city to the equator.