If a moving object loses mass, how can it keep its momentum constant? a. by speeding up b. by slowing down c. by changing direction d. by speeding up or slowing down

Which conditions are necessary for natural selection to occur? select all of the answers that apply. a. inheritable adaptations vary among individuals. b. the population size is increasing. c. more individuals are born than can survive. d. fitness varies among individuals. e. the environment changes suddenly and drastically.

Compare the depth of field when focusing with low power and high power. which power has the greater depth of field?

What is it called when part of a cell membrane closes around a molecule to allow the molecule to enter the cell? a. passive transport b. diffusion c. endocytosis d. exocytosisc. endocytosis