Why do cells have a plasma membrane? a) to separate protiens from the nucleus b) to distinguish plants from animals c) to define the size of the cell d) to separate the inside of the cell from its environment plzz well make brainlest plz answer in less than 10

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 of these serves as a reference for comparison during a scientific investigation? a)outcome variable (dependent variable) b) test variable (independent variable) c)control group d)hypothesis

Asap what occurs after cytokinesis is completed at the end of meiosis 1?