Which statement best characterizes the life cycle of cnidarians?
A. All species have both polyps and medusae.
B. Some have only polyps, some have both polyps and medusae, and others have medusae and a reduced polyp stage.
C. Some species have only medusae and others have both polyps and medusae.
D. Some species have only polyps and others have both polyps and medusae.
E. Some species have polyps and others have medusae, but no species has both.
B. Some have only polyps, some have both polyps and medusae, and others have medusae and a reduced polyp stage.
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Cell structures that function in cell division are
A. Golgi bodies. B. ribosomes. C. granules. D. centrioles.
A hydroxide ion has an oxygen atom
A. only. B. and an extra electron. C. and a hydrogen atom, and an extra electron. D. and a hydrogen atom, and an extra proton.
Photosynthesis occurs in many branches of the eukaryotic tree
A. true B. false
In a haploid dominant species
A. the multicellular organism is diploid and only the gametes are haploid. B. the multicellular organism is haploid and only the gametes are diploid. C. diploid cells are produced by mitosis and haploid cells are produced by meiosis. D. the multicellular organism is diploid, and only the zygote is haploid. E. the multicellular organism is haploid, and only the zygote is diploid.