Controls what substances can move in and out of the cell. it also protects the cell from its surroundings.
Variation means difference in genetic makeup between individuals within a specie.
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Answer:
Mountains are cooler than plains because with increase in height the temperature decreases. EXPLANATION: Mountains are located in high elevations and plains are located in low elevations. Their respective heights are measured by term called as their height above sea level.
The answer with the 2 pots of the same size: one with 2 pounds of potting soil, one with 2 pounds of dirt, 2 tomato plants of different sizes and the same type