The heart of amphibians has __________ chambers. The hearts of birds and mammals have
__________ chambers.
a. two; three
b. three; four
c. two; four
d. three; five
e. three; two
B
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Based on what you see here and your knowledge of selection, what inference can you make about the mouse population?
1.The population has undergone directional selection since the white mice blend into the environment.
2.Disruptive selection has led the population to two color variations, black and white.
3.There are two separate species of mice. The white species is dominant since it blends into the sand.
4.Owls and white mice are co-evolving to be able to feed at night.
Which type of cell would probably provide the best opportunity to study lysosomes?
a. muscle cell d. leaf cell of a plant b. nerve cell e. bacterial cell c. phagocytic white blood cell
In an estuary, the zone of maximum vertical difference in density of water layers is called the
A) thermocline. B) pycnocline. C) mixing zone. D) hypolimnion.
You have been running a high fever, have stomach cramps, and have felt weak and disoriented for 5 days, so you set up an appointment with your physician. After asking you a few questions, she starts a physical examination by probing for swollen areas in
your abdomen. You immediately sense that she is looking for A) lymph nodes. B) histamines. C) antibodies. D) antigens.