Which characteristics best describe earthworms?
a. polychaete; fluid filled coelom
b. oligochaete; open circulatory system
c. moves by only longitudinal muscle contraction and hydrostatic skeleton
d. oligochaete; scavengers; closed circulatory system
e. hermaphrodites that fertilize themselves; closed circulatory system
d
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Meerkats are small desert mammals that live in groups of 20–50 animals. You observe one meerkat standing upright on a stump, looking around, while other meerkats forage for food. You hypothesize that this is an example of kin selection
What additional information would you need to know to evaluate your hypothesis? A. the body size of this meerkat relative to other members of the group B. the gender of this meerkat as well as that of all other members of the group C. the degree of genetic relatedness of this meerkat to all members of the group D. all other activities of this meerkat as well as those of all other members of the group E. the foraging success of this meerkat as well as that of all other members of the group
Which cell type secretes a chemical message
for the purpose of cellular communication?
a. muscle b. neuron c. keratinocyte d. fibroblast e. platelet
Which dispersion pattern is most likely to be seen in animals that live in social groups?
1.Clumped 2.Integrated 3.Random 4.Uniform
Signals from the _____excite motor neurons, resulting in action potentials in muscle fibers.
Fill in the blank(s) with the appropriate word(s).