In a tide pool, fifteen species of invertebrates were reduced to eight after one species was removed. The species removed was likely a(n) _____

A) pathogen
B) keystone species
C) herbivore
D) resource partitioner
E) mutualistic organism


Answer: B

Biology & Microbiology

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The molecule shown above is the purine ____

a. thymine b. adenine c. uracil d. guanine e. cytosine

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Which of the following substances is

hydrophobic?

a. canola oil b. sodium chloride c. sugar d. water e. the potassium ion

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The kelp shown in the accompanying figure represents the ____ stage in its life cycle

a. spore-bearing b. gamete-forming c. haploid d. motile e. feeding

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What description applies to accessory organs?

A) They aren't included in organ systems. B) They secrete enzymes required for digestion. C) They don't contain connective tissue. D) They assist other organs in the circulatory system.

Biology & Microbiology