A girl received one recessive allele for blue eyes from her father and a recessive allele for blue eyes from his mother. Which of the following best describes the girl’s genetic type?

Which best describes red blood cells? a. they are colorless b. they protect against disease-carrying microorganisms c. they transport oxygen throughout the body d. they aid in blood clotting

The model illustrates a process by which a substance is taken up by a cell

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.