There are over 11,500 species of these protists that have ornate, glasslike shells.
A. green algae
B. diatoms
C. brown algae
D. red algae
Answer: B
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What is a global impact of glacier recession?
a. lower crop yields b. increased precipitation c. rising sea levels d. fewer tropical storms
________ are small organic molecules that are required in minute amounts for metabolism
Fill in the blank(s) with the appropriate word(s).
Charles Darwin believed that artificial selection was
A) a process completely identical to natural selection. B) impossible. C) unimportant. D) similar in many ways to natural selection. E) a common phenomenon in nature.
Which of these valves is found between the right atrium and the right ventricle?
A. tricuspid valve B. bicuspid (mitral) valve C. aortic semilunar valve D. pulmonary semilunar valve E. interventricular septum