. Diffusion occurs because A molecules constantly move and collide with each other.
B the concentration of a solution is never the same throughout a solution.
C the concentration of a solution is always the same throughout a solution. D molecules never move or collide with each other.

Match the following terms and definitions. 1. species that are adapted to live in equilibrium at carrying capacity population density 2. population growth that reaches equilibrium and carrying capacity population 3. death rate mortality 4. birth rate k-selected 5. a group of interacting individuals of the same species within the same geographic area natality 6. the number of organisms living in a particular area logistic growth