Gene flow is restricted between subspecies because of some extrinsic barrier, such as rivers or mountain ridges
Indicate whether the statement is true or false
TRUE
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How old is the oldest fossil we have food of our own species, Homo sapiens?
A. About 3 thousand years old B. About 6 million years old C. About 6 thousand years old D. About 300 thousand years old
Which of the following statements describes the
value of fungi in the environment? a. Fungi “fix” nitrogen from the air for use by plants. b. Fungi trap sunlight energy in the form of carbohydrates. c. Fungi release elements from organic matter. d. Fungi enrich the soil by decreasing the rate of decay of organic matter. e. Fungi remove toxic metals from the soil.
The thymus produces ________, a hormone that stimulates the maturation of specialized white blood cells called T cells
A) testosterone B) thyroxine C) ACTH D) thymosin E) insulin
The ATP made during fermentation is generated by which of the following?
A) the electron transport chain B) substrate-level phosphorylation C) chemiosmosis D) oxidative phosphorylation E) aerobic respiration