16. The method of movement that requires the expenditure of ATP molecules is a simple diffusion
c. osmosis
b. facilitated diffusion
d. passive transport

How can you approximate the number of calories required to keep you in energy balance?

Describe two recent or ongoing space missions.

2. which of the following statements does not accurately describe stem cells? a. embryonic stem cells make up the inner cell mass of a blastocyst. b. with more research, stem cells may be used to repair or replace damaged cells. c. the use of stem cells is without any objections since it can be used in therapies to humans. d. adult stem cells are multipotent and can differentiate into many types of cells.