The adaptive benefit of flowers in the angiosperms is that they
A. are structures of plants that are only ornamental and have no reproductive value in plants.
B. produce both pollen and egg cells.
C. are produced by both gymnosperms and angiosperms.
D. produce egg cells only.
E. produce pollen only.
B. produce both pollen and egg cells.
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The larvae of some insects are merely small versions of the adult, whereas the larvae of other insects look completely different from adults, eat different foods, and may live in different habitats
Which of the following is most directly involved in the evolution of these variations in metamorphosis? A) artificial selection of sexually immature forms of insects B) changes in the homeobox genes governing early development C) the evolution of meiosis D) the development of an oxidizing atmosphere on Earth E) the origin of a brain
Which trait is not found in metabolically active tissues that will encourage the release of oxygen?
a. High temperature b. Release from heme c. High pH d. High CO2 partial pressure e. Low pH
These small short-lived organisms have a reproductive strategy to produce many offspring that have fluctuating populations.
A. r-strategists B. k-strategists C. l-strategists D. s-strategists
Describe the environmental water cycle.
What will be an ideal response?