Ascientist testing the affects of a chemical on apple yeild sprays an orchard with the chemical. a second orchard does not receive the chemical. in the fall, the number of apples harvested from each forest is counted. which of the following is the independent (manipulated) variable in the experiment? the chemical the number of apples the first orchard the second orchard

The best answer to the question: Which of the following is the independent (manipulated) variable in the experiment, would be: The chemical.

Explanation:

The reason is that all other variables in the experiment remain the same and are unchanging. The point of the experiment is to see what the effects of a specific chemical, on apple yield, is. To achieve this, the scientist has two orchards, each planted with apple trees and both are expected to produce apples. However, the scientist wants to see how the chemical will affect the total yield. So, the one variable that he manipulates on the experiment, is the chemical itself, spraying one orchard with it, and the other leaving it chemical-free. In the end, the results are counted and a conclusion in reached.

they have identical fossils of organisms that have evolved over time.

both have animal fossils preserved in them due to weathering and erosion.

they contain different fossils because life on earth has changed through time.

the fossils in them were formed on the surface of earth due to exposure to sunlight.