Select the phylum that includes deuterostome animals that are exclusively marine and have radial symmetry as adults.
A. Porifera
B. Rotifera
C. Echinodermata
D. Chordata
E. Cnidaria
C. Echinodermata
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Answer the question using the accompanying figure. Which letter(s) represent(s) the limnetic zone?
a. A only b. B only c. C only d. A and B e. B and C
A type of symbiosis in which one member of the relationship benefits with no effect on the other is
A. parasitism. B. mutualism. C. commensalism. D. predation. E. intraspecific competition.
Undersecretion of growth hormone in childhood results in
a. pituitary gigantism. b. acromegaly. c. pituitary dwarfism. d. diabetes insipidus. e. cretinism.
All of the following are nonspecific defense mechanisms or barriers used by an animal except:a
acid secretions of the stomach. b. inflammation. c. antibodies. d. mucus in the respiratory tract. e. skin.