In the last 20 years one concern of scientists who study amphibians is that
A. genetic diversity is being increased too rapidly for proper maintenance.
B. the edge effects are causing declines in species numbers.
C. DDT is affecting reproduction by thinning the egg membranes.
D. populations are diversifying rapidly and speciation is occurring.
E. many species are declining or have gone extinct in recent years.
E. many species are declining or have gone extinct in recent years.
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Which statement related to gymnosperm reproduction is true?
A. Many gymnosperms rely on insects for pollination. B. Gymnosperms, like ferns, alternate generations. C. Gymnosperm reproduction is so inefficient that gymnosperms do not grow very tall or live for very long. D. Spores produce pollen grains, which contain sperm.
The end of mitosis is determined by the end of which phase?
a. prophase b. metaphase c. anaphase d. telophase e. cytokinesis
What causes the "pulling" of a water column from the soil to the leaves?
A) hydrogen bonds B) gravity C) hardiness D) active transport
Mitochondria perform cellular respiration, a process that uses oxygen, generates carbon dioxide, and produces chemical energy for the cell
Which answer below indicates a correct pairing of material "burned" and the form of energy produced during cellular respiration? (a) fat, ADP (b) sugar, fat (c) sugar, ATP (d) fat, protein