Saber teeth found in different groups of extinct carnivorous mammals are considered ________ structures, as the fossil record shows that saber teeth evolved independently among the groups.
Fill in the blank(s) with the appropriate word(s).
homoplastic
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Arrange the small intestine components in order of size from largest to smallest
What will be an ideal response?
A gaseous hormone produced by plants that helps control fruit ripening is
A. carbon dioxide. B. auxin. C. ethylene. D. chlorophyll. E. carotene.
Cotyledons and endosperm both provide nutrition. What is the difference between them?
A) Cotyledons provide nutrition for the developing embryo; endosperm provides nutrition for the young seedling. B) Endosperm provides nutrition for the developing embryo; cotyledons provide nutrition for the young seedling. C) Cotyledons are found only in flowering plants; endosperm is found only in young ferns. D) Endosperm is found only in monocots; cotyledons are found only in dicots. E) Endosperm is always photosynthetic; cotyledons are usually not.
Carnivorous plants evolved because which of the following nutrients is often extremely limited in their habitats?
A. carbon B. nitrogen C. iron D. O2 E. CO2