Mollusks are distinguished from other animal groups by the presence of (select all that apply)
A. a mantle that plays a role in breathing and
excretion.
B. a toothlike radula in some.
C. a segmented body with a hydrostatic
skeleton.
D. ecdysis.
E. none of these
A,B
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The term “2n” means
(a) the diploid chromosome number is present. (b) the haploid chromosome number is present. (c) chromosomes within a single nucleus exist in homologous pairs. (d) both a and c.
Antibodies are _____
a. antigen receptors c. proteins b. made only by B cells d. all of these
The primary sources of oxygen in a water body are the atmosphere and
A) decomposition. B) evaporation. C) photosynthesis. D) respiration.
Thick, water-storing leaves and stems and wax-coated leaves are adaptations to:
A) deserts. B) tropical rain forests. C) northern coniferous forests. D) tropical scrub forests. E) temperate deciduous forests.