If a woman were exposed to a chemical that caused the cilia in her reproductive system to stop moving, what specifically is likely to happen?
A) She would no longer be able to ovulate, and early menopause would occur.
B) Ova could no longer pass through oviducts.
C) Spontaneous abortions would occur.
D) She would have many ovarian cysts.
B
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An example of homoplastic structures is the wing of a butterfly and:a
the wing of a moth. b. the wing of a bird. c. the antenna of the butterfly. d. the legs of the butterfly. e. the antenna of a moth.
Answer the following statement(s) true (T) or false (F)
1. There is only a single type of pain receptor. 2. Hormones must be present at high concentrations to elicit an effect. 3. A molecule can act as both a neurotransmitter and a hormone. 4. The brain controls organ system function only through direct contact with sympathetic or parasympathetic nerves. 5. The thyroid requires negative feedback to prevent overgrowth.
What element is in the cell walls of grasses and horsetails, which gives them such a sharp, cutting edge, like a piece of glass?
a. carbon b. silicon c. chlorine d. boron e. nitrogen
____________________ traits are controlled by two or more genes and significantFill in the blank(s) with the appropriate word(s)