Use of CFCs depletes the __________ in the upper

atmosphere and allows more UV radiation to reach
Earth’s surface. Fill in the blank(s) with the appropriate word(s).


Answer: ozone layer

Biology & Microbiology

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After giving birth, female bighorn sheep lick their newborn lambs. This behavior continues off and on for up to 6 hours, after which mothers no longer lick their lambs. What is/are the ultimate cause(s) of this behavior? Check all that apply.

_____ Hormones released during labor stimulate motor neurons in female bighorn sheep, causing them to lick and groom their lambs. _____ The lamb is stimulated by the licking to begin nursing from its mother and the sooner a lamb begins nursing, the better its chances for survival. _____ Female bighorn sheep remember being licked by their mothers and know they must teach this behavior to their own offspring. _____ Licking the lamb removes excess moisture from its coat, preventing hypothermia. _____ When licking the lamb, the mother learns its unique scent so she can distinguish it from other lambs and offer it protection from predators or extreme weather.

Biology & Microbiology

How many genes are carried on the X chromosome?

a. 260 b. 20,000 c. 6,660 d. 2,000 e. 3,450

Biology & Microbiology

Reduction of nitrate to nitrite by Paracoccus denitrificans is an example of anaerobic respiration.

Answer the following statement true (T) or false (F)

Biology & Microbiology

Refer to the figure above. Which of the following forms a monophyletic group?

A) A, B, C, D B) C and D C) D, E, and F D) E, F, and G

Biology & Microbiology