The abbreviation for a procedure to treat infertility in which eggs and sperm are combined in a laboratory dish, and two resulting embryos are placed inside the uterus is

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.

Which statement is true about the cell theory? a) it is well-supported by evidence. b) it is unchangeable and permanent.

What causes temperature extremes in the desert