Which of the following has the least opportunity for recovery?
a. a forest burned by fire cause by a lightning strike
b. a forest cut down by a logging company
c. a forest flooded for a week following heavy spring rains
d. a forest decimated by an avalanche

Which of these statements is true about autotrophs, but not heterotrophs? a. they use sugar and oxygen to make carbon dioxide and water. b. they use chlorophyll and oxygen to make carbon dioxide and water. c. they use sunlight, water, and carbon dioxide to make sugars. d. they use sunlight, water, and oxygen to make chlorophyll.