When a horse and a donkey mate, they produce infertile hybrids called mules. according to the species concept, horses and donkeys are

Which statement about the immune system is false? a. lymphocytes reduce inflammation, b. b cells remember specific pathogens. c. most white blood cells kill bacteria d. white blood cells are made in lymph nodes.

What would be the result if crossing over did not happen during meiosis in humans? a. there would be less genetic variation in humans. b. parents would be more likely to look like their children. c. the human population could not reproduce. d. children would have more chromosomes.

Penelope studies how the structure and function of the nervous system is related to behavior. she is a psychologist