The segmented worms of the phylum Annelida
a. have an open circulatory system.
b. possess setae on each segment.
c. are acoelomate.
d. move by use of flagella.
e. display radial symmetry.
B
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For which of the following is there fossil evidence of 100 extinct species from five continents, with
only one extant species?
a. humans b. birds c. marine mammals d. insects e. horses
The vestibular apparatus ____
a. controls depth perception b. consists of one fluid filled semi-circular canals c. contains mechanoreceptors that detect fluid shifts d. contains no sensory receptors e. contains olfactory receptors that detect odorous chemicals
In order for a muscle contraction to occur, cross-bridges must form between which one of the following structures within a muscle cell?
A) the plasma membrane and the sarcoplasmic reticulum B) troponin and tropomyosin C) calcium and tropomyosin D) acetylcholine and muscle cell receptors E) actin and myosin
In science, what would an individual's personal experience or endorsement be considered?
What will be an ideal response?