Descriptive investigations involve collecting data about a system, but not making it?

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.

What does it mean for a cell membrane to be selectively permable

Parasitism could be considered a form of which of these types of relationships? -mutualism -commensalism -predator-prey -mimicry