Which of the following are theories? Select all that apply. A. Detergent type does not affect how well a t-shirt stain is removed.
B. Earth's crust is divided into plates that are in constant motion.
C. The rate of plant growth is dependent on how much light is present.
D. If a bucket of water is left uncovered, then it will evaporate faster.
E. All matter consists of tiny particles called atoms.

I’m doing some practice exam questions for biology, and i’m not sure how to do these 3 parts to the question.

Elephants in the savanna regions of africa dig holes in dried up river beds to reach water lying just below the surface. these holes provide drinking water for other animals as well. so, without the elephants, many animals might otherwise die from lack of water during the dry season. the location in which the elephants live is an example of a/n and the role they play in creating water holes is an example of a a) ecosystem; habitat b) community; niche c) habitat; niche d) niche; habitat

The normal shape of an enzyme is as shown in structure a. if the enzyme’s shape changes to that shown in structure b, what are two consequences of this change?