13. which of the following is not required by animals to control body temperature? a. animals must switch between ectotherm and endotherm methods. b. animals must be able to get rid of excess heat when temperatures increase. c. animals must be able to conserve heat when temperatures drop. d. animals must find a source of heat.

The scales shown in the introduction measure mass, or the amount of matter in a particular object. the scientific law of conservation of mass states that matter cannot be created or destroyed during a chemical reaction, but it can change from one form to another. did the simulation support this scientific law? explain why or why not.

Read the article and use the information to answer the following questions. active transport in active transport, molecules are moved across the cell membrane with the of neurons electrical impulses proteins. inhibitors 3 of 3 vity

What is the next step in muscle contraction after the actin changes shape