Female peafowl (peahens) prefer to breed with males (peacocks) that have the longest tails. However, the longer the peacock's tail, the less well he can fly and the more likely he is to be eaten by predators
Which of the following statements is TRUE?
A) Both sexual selection and natural selection favor shorter tails in peacocks.
B) Sexual selection favors longer tails, but natural selection favors shorter tails.
C) Sexual selection favors shorter tails, but natural selection favors longer tails.
D) Both sexual selection and natural selection favor longer tails in peacocks.
B
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a. immunity caused by the body producing antibodies in response to an antigen b. immunity caused by exposure to a vaccination or other pathogen c. a naturally occurring immunity caused by genetic factors or physiology d. a type of immunity caused by an increase in white blood cell productivity
Which of the following are the three most common sites for healthcare-associated infections?
a. bloodstream b. surgical sites c. central nervous system d. urinary tract e. skin f. respiratory tract
Sebaceous glands are also known as
a. sweat glands. b. tear glands. c. digestive glands. d. oil glands. e. endocrine glands.
The light microscope was used to observe the cellular structure of cork by _______, who named the chambers "cells."
a. Schleiden and Schwann b. Hooke c. Virkow d. Pasteur