The allantois
A) destroys old blood cells.
B) gives rise to the yolk sac.
C) forms blood cells.
D) is part of the placenta.
C) forms blood cells.
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Which one of the following statements about cyanobacteria is false?
A) Although cyanobacteria are photosynthetic, they do not produce oxygen as a result of photosynthesis. B) At one time, cyanobacteria were called blue-green algae. C) Some cyanobacteria are capable of nitrogen fixation.
Mosses have threadlike structures, called ____, that hold the gametophyte in place
a. mycorrhizae b. fronds c. rhizoids d. sporangia e. rhizomes
Sound waves enter the ear through the ____
a. cochlea b. auditory canal c. tympanic membrane d. round window e. auditory nerve
Fungi are
A. saprophytes. B. mutualistic. C. decomposers. D. All of the above are correct.