Members of this group of animals have the following characteristics: spines on surface; radial symmetry; marine habitats only; tube feet; and water vascular system.
A. Mollusca
B. Annelida
C. Echinodermata
D. Arthropoda
C. Echinodermata
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Which cells form the lung tissue component of the respiratory membrane?
A) type I alveolar cells B) type II alveolar cells C) alveolar macrophages D) ciliated cells E) goblet cells
The second phase of the VMH syndrome, during which the obese animal maintains a stable level of obesity
What will be an ideal response?
Some kinds of shrimp obtain food by cleaning parasites from the surface of fish. This can be termed mutualism because
A. neither participating member is damaged. B. both members benefit from the relationship. C. the shrimp benefit and their hosts are not injured. D. the host fishes cannot survive without the shrimp.
Paracrine signaling is different from other types of signaling in that the signaling molecule:a
is produced by endocrine glands. b. binds to a receptor. c. is secreted by neurons. d. is transported in the blood. e. acts on nearby cells