Which part of the brain is especially important in emotions?
a. Broca's area
b. the hippocampus
c. the amygdala
d. the thalamus
e. both b and c
E
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The maximum number of organisms that can be sustained in a particular environment is known as what?
a. maximum yield b. maximum load c. carrying capacity d. growth capacity
In the human digestive system, ________ is the rhythmic smooth muscle contractions that aid in moving food along the system.
A. countercurrent exchange B. phagocytosis C. peristalsis D. rumination E. sphincter contractions
Check all of the reasons that temperature is important for organisms.
A. It has a direct effect on blood cell production. B. It affects the fluidity and rigidity of plasma membranes. C. It affects the rate of biochemical reactions.
Dr. Edward Jenner realized that cows have a disease called cowpox, which is like a disease that infects humans called smallpox; Jenner noticed that milkmaids whose hands were infected with cowpox were not contracting smallpox. Jenner infected a child with the pus from a cowpox blister and found that the child did not contract smallpox. Which statement represents a supporting hypothesis?
A. The smallpox virus was so similar to the cowpox virus that the child's immune system ignored the smallpox virus B. The cowpox infection will have no effect on the child's immunity to the small pox virus. C. The cowpox virus prevented the small pox virus from entering the child's immune system. D. The cowpox infection will prevent the child from being infected by the small pox virus.