On average, one tree produces nearly 260 pounds of oxygen a year.
Answer:
Plants don't have sensation of time, at least that we know till now. However plants have different stimuli against the different environmental change i.e lack of water causing yellow and fall of leaves. Such seasonal responses are reaction to environmental changes rather than timeline.
Answer: d
Explanation:
They are compe for the same prey which means this is a survival competition
Answer:
D
Explanation:
Animal and plant cell have vacuole but animal cell's is very small compared to the plant cell that is used to maintain water balance in the cell.
The control variable never changes. It is constant.
The independent variable is changed by the experimenter in order to produce a change in the Dependent variable.
The independent variable is the "factor" that you are looking for.
For Example:
One might be testing the effects of mold growth speed on different types of bread.
The researcher would keep everything he was not testing constant (control variables.)
A control variable would be the mold type.
But the researcher would modify the bread type, thus finding which bread type mold grows fastest on. The bread type is the Independent variable.
The mold growth speed that is changed due to a change in the bread type (Ind. Variable) is thus the dependent variable.