What explains why populations fluctuate around the carrying capacity?

a) immigration exceeds emigration, creating an increase in population size.
b) birth rates equal death rates as limiting factors affect population sizes.
c) density independent factors play a greater role than density dependent factors. d) mutualistic relationships exceed parasitic relationships, increasing population sizes.

Which layer will become saturated first when rain falls?

Cells destroy body cells infected by a virus or bacteria.

Read the scenario below and answer the question that follows. hallie is reading a novel in the library when susan, her best friend, slumps down in a chair next to her. susan doesn't say anything, but hallie knows that susan is upset because she is slumping in her seat and rolling her eyes. a psychologist would explain that hallie is interpreting her friend's emotion based on a. the behavioral component of emotion b. her friend's ability to regulate emotion c. the verbal component of emotion d. the physiological component of emotion select the best answer from the choices provided a b c d