A gastrovascular cavity is found in all of the following except:a
hydras
b. cnidarians
c. sponges
d. flatworms
e. jellyfish
C
Biology & Microbiology
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Cells with ____ are able to harvest the greatest amount of energy from electrons
a. double membranes b. photosystems c. cytochromes d. chloroplasts e. nuclei
Biology & Microbiology
Which mechanism is used to encourage the movement of water over gills?
a. beating of cilia b. contraction of the diaphragm c. relaxation of a muscular mantle d. a fish swimming with its mouth closed e. relaxation of body muscles
Biology & Microbiology
The genetic code includes
A) 3 start codons and 1 stop codon. B) 2 start codons and 2 stop codons. C) 1 start codon and 3 stop codons. D) 0 start codons and 4 stop codons.
Biology & Microbiology
The male part of a flower is the
A. petal. B. pistil. C. sepals. D. stamen.
Biology & Microbiology