I believe the correct answer is A. Increases the rate of a chemical reaction. This is because they act as catalysts.
The amount of water on the planet is fixed; it neither increases or decreases. Glaciers are sheets of moving ice. This water to form these extensive sheets must come from somewhere. The water comes from the most extensive store on the planet; the oceans. Ice Ages always corresponds to periods of low sea level because much of the ocean water is is land locked as glaciers.
Bright sunlight, lack of competitors, and more carbon dioxide
Recombinant DNA is the answer
Diffusion is used. Diffusion is one principle of moving of cells
