The photic zone in aquatic environments is typically about how deep?
A. 1000 m
B. 10 m
C. 500 m
D. 100 m
E. 50 m
Answer: D
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Insects are likely so successful because of which adaptations that allow them to live in a wide range of habitats? Select all that apply
A. desiccation-resistant eggs B. wings C. metamorphosis D. diverse feeding appendanges E. unique respiratory system of spiracles and tracheae
Steroid hormones can trigger gene expression in a select number of cells because
a. only target cells allow the steroid hormone to cross the plasma membrane. b. nontarget cells have a steroid hormone response element encoded in their DNA. c. only target cells have the correct receptor in their cytosol to bind to the hormone. d. nontarget cells lack the genes found in target cells. e. only target cells have the genes that steroid hormones activate.
The abiotic factor that has had the greatest evolutionary effects on deep-sea animals is:
a. low temperatures. b. high pressure. c. low nutrients. d. lack of light. e. varying salinity.
An increase in the number of chromosomes present in an organism is known as
A. polyploidy. B. gene flow. C. convergent evolution. D. punctuated equilibrium.