Which of the following statements about tunicates is false?
a. Tunicates are in subphylum Cephalochordata.
b. Tunicates are in phylum Chordata.
c. Tunicates are freshwater organisms.
d. Tunicates develop as deuterostomes.
e. Tunicates are a living chordate group
C
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If a meteor impact or volcanic eruption injected a lot of dust into the atmosphere and reduced the sunlight reaching Earth's surface by 70 percent for one year, which of the following marine communities most likely would be least affected?
A) deep-sea vent B) coral reef C) intertidal D) pelagic E) estuary
During exercise, O2 is depleted in muscle tissue. What effect would this have on internal respiration?
A) There would be increased diffusion of O2 out of the blood and into the muscle tissue. B) There would be decreased diffusion of O2 out of the blood and into the muscle tissue. C) There would be increased diffusion of O2 out of the blood and into the lungs. D) There would be decreased diffusion of O2 out of the blood and into the muscle tissue and a decrease in heart rate to bring more O2 to the exercising muscle.
The process by which allele frequencies are altered in a small population due to chance is called
A) genetic drift. B) random mutation. C) fitness. D) random evolution. E) assortative evolution.
Hagfishes and lampreys differ from other fishes because they lack ________
Fill in the blank(s) with correct word