The United Nations projects a stabilizing world population at
A. two billion.
B. seven billion.
C. ten billion.
D. fourteen billion.
E. None of these choices are correct.
C. ten billion.
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The sex of most mammals, birds, and insects is determined by:
a. the temperature. b. the external environment. c. sex chromosomes. d. chance. e. the internal environment
Who proposed that all animals and plants consist of cells that contain a nucleus?
a. Matthias Schleiden b. Rudolf Virchow c. Theodor Schwann d. Anton van Leeuwenhoek
The products of the Krebs cycle include
A) ATP only. B) carbon dioxide and energy carriers only. C) carbon dioxide only. D) energy carriers only. E) ATP, carbon dioxide, and energy carriers.
Why do some hormones need to trigger a "second messenger" to activate a target cell?
What will be an ideal response?