Aprokaryote is more likely to use which of the following modes of metabolism to release energy if it is in an environment without oxygen, dies when exposed to oxygen, and uses fermentation
a: obligated anaerobe
b: facultative anaerobe
c: heterotroph
d: photoautotroph

try using substitution:

x + y - 6 = x - y. (i'm not giving you the exact answer). since 0 = x - y, then sub 0 in the equation with x - y. combine your like terms, and then use inverse operations, and you'll have your answer.

: -)

a. by using fur or clothes to trap heat energy near the body