Which of the following was the most likely
food source for first terrestrial tetrapods?
a. leaves
b. insects
c. small mammals
d. worms
e. eggs
B
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Compare the flow of energy and the flow of nutrients in ecosystems.
A. Both function in the same way, as both energy and nutrients get recycled in ecosystems. B. Both function in the same way, as both energy and nutrients come in and out of ecosystems. C. Energy is recycled within ecosystems, while nutrients come in and out of ecosystems. D. Energy comes in and out of ecosystems, while nutrients are recycled within ecosystems.
A homozygous recessive where "A" represents the trait has two recessive alleles symbolized by
__________. Fill in the blank(s) with the appropriate word(s).
The term for a close association between organisms of two or more species is
A) symbiosis. B) exotoxin. C) endotoxin. D) mixotrophic.
Consider a large algal colony like Cladophora or Microcystis, which plays host to a complex biofilm of bacteria. What is a specific benefit the algal host may receive from the relationship?
A. Glucose B. A physical habitat C. Water D. Vitamin B12 E. Oxygen