The circulatory fluid in echinoderms is _____.
a) blood
b) mesohyl
c) water
d) saline
Ans: c) water
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Cephalization is
(a) the division of the trunk into a scolex, neck, and body. (b) the presence of a head with sense organs. (c) sexual reproduction involving self-fertilization. (d) the ability to replace lost body parts.
Epinephrine ______.
a. is produced by the pituitary gland b. is another word meaning norepinephrine c. is secreted only by the sympathetic nervous system d. is strongly related to and has been used as an index of stress
What part of a cell's cytoplasm is responsible for the diversity of nerve cell shape?
A. the cytoskeleton B. the endomembrane system C. the nucleus D. All of the answer options are correct.
Beginning with the simplest level of structure, which order of organization of genetic material is CORRECT?
A. nucleotide, DNA, chromosome, gene, genome B. DNA, nucleotide, gene, genome, chromosome C. nucleotide, DNA, gene, genome, chromosome D. DNA, nucleotide, gene, chromosome, genome E. nucleotide, DNA, gene, chromosome, genome