Why have plants evolved secondary compounds?
What will be an ideal response?
Secondary compounds serve as defense mechanisms against animal consumers, plant competitors, and pathogenic microorganisms.
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Maintaining a steady-state internal environment, despite a changing external environment, is called ________.
A. heterostasis B. homeostasis C. biofeedback D. bioregulation
Whether a germ cell develops into eggs or sperm is determined by
a. the presence of the X chromosome. b. the presence of the Y chromosome. c. the time at which meiosis begins during development. d. the genetic sex of the individual. e. whether or not meiosis and mitosis can occur.
Immerse a living human cell in a hypotonic solution, and water will tend to _____
a. diffuse into the cell c. show no net movement b. diffuse out of the cell d. move in by endocytosis
The origin of a skeletal muscle is
a. attached to the less mobile portion of the skeleton. b. attached to the portion of the skeleton that moves when the muscle contracts. c. never attached to the skeleton. d. its belly.