What causes a layer of cells to form between a leaf and the stem, causing the leaves to fall

Air pollution is only caused by human activity, select the best answer from the choices provided ot of true or false

The energy of blowing wind can be harnessed to create electricity. why is wind considered a renewable energy source? a) wind does not cause destruction of the environment.b) wind turns the blades of a windmill that creates electricity.c) wind provides only a very small amount of electricity to the united states.d) wind comes from atmospheric conditions that are available indefinitely.

18. how do the cells in meiosis differ from the cells in mitosis?