The answer is D. Gravity.
Gravity attracts objects to the surface of the Earth. Take a falling brick, for example, the brick has more mass, therefore, there is more attraction between the brick and Gravity. The brick is a solid object and is heavier as well.
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People would be able to grow better food to sale or feed their families with.
Answer: 1) a stem bends towards light. Tropism is the way a organism responds to its surrounding, the plant bends to the light, to survive.
2) Stems and Gravity. The plant wants to be towards the sun, and as close to the light as possible, gravity pushing down, will negatively effect the plants efforts to reach the light.
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