Which pairs of hormones have opposite effects?
A) testosterone and melatonin
B) progesterone and insulin
C) parathyroid hormone and calcitonin
D) oxytocin and prolactin
Answer: C
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The Sun provided ____ in order to power the development of life on early Earth
a. continual energy b. a temperature range for liquid water to form c. radiation to power mutations d. continual energy and a temperature range for liquid water to form e. continual energy, a temperature range for liquid water to form, and radiation to power mutations
In ferns
a. xylem and phloem are present in the sporophyte. b. the sporophyte is the dominant generation. c. the leaf is called a frond. d. all of the above are true.
Regulation & Environmental Sensing
What will be an ideal response?
One method of maintaining the genetic isolation of a population is the inability of sperm to fertilize eggs of a different species. This is called
A) gametic incompatibility. B) behavioral isolation. C) hybrid inviability. D) ecological isolation. E) temporal isolation.