In order to conduct a research you should have an dependent variable, independent variable and the control variable. so in order to study phototropism, then you should need sun light and the growth of the plant and you must have a control that why you need a dark room.
The first one is 100% and the second one is 50%
Answer:
genus and species
Explanation:
Species is a class of individuals and genus is the rankings right below species
<span>An agent, such as radiation or a chemical substance, that causes genetic mutation.
So your answer is ....
B. an agent that causes mutation in DNA
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Natural selection is the process by which some organisms are better adapted than others and survive and reproduce more successfully