What should fire fighters do with their PPE in rehabilitation?
a. keep it on in cold or wet weather
b. remove helmets, hoods and gloves
c. keep it on
d. remove it
Answer: d. remove it
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Many male songbirds are brightly colored. However, the color of the birds is determined by a balance of
A. natural selection against bright colors by predation and sexual selection in favor of bright colors. B. gene flow that reduces bright colors and natural selection in favor of bright colors. C. mutations that reduce bright colors and sexual selection in favor of bright colors. D. mutations that reduce bright colors and gene flow in favor of bright colors. E. natural selection against bright colors by predation and mutations that introduce bright colors.
Which of the following statements is an example of active transport?
1.Dye molecules diffusing after being dropped into a beaker of water. 2.Phospholipids drifting sideways in the plasma membrane. 3.Glucose binding to a transport protein to cross the membrane with the concentration gradient. 4.Calcium pumps in muscle cells transporting calcium against the concentration gradient.
The opening of the uterus is referred to as the
A) endometrium. B) oviduct. C) cervix. D) fimbriae. E) clitoris.
Selective breeding has been used for centuries to ________
A) remove favorable traits from plants and animals B) enhance growth and yield from domesticated plants and animals C) train crops to grow in more favorable environments D) ensure purity of genetic lines