Which organelles converts the chemical energy stored in food into unseable energy

Identify the composition of oceanic and continental crystal rocks.in a model of earth’s interior,where would these rocks appear?

Eutrophication caused by human nutrient pollution.

Which of the following must be true for a fossil organism to be useful as an index fossil? a. the fossil organism must be widespread geographically. b. the fossil organism must be abundant. c. the fossil organism must be limited to a short span of geologic time. d. all of the above.