Plants utilize chlorophyll containing chloroplasts and mitochondria. what is the purpose of motochodria when a cell already has chloroplasts?

Microorganisms are involved in each of the following processes excepta. smog production. b. food production. c. infection. d. o2 production. e. decomposition of organic material.

Why is it important to study each branch of earth science?

Are the layers of rock above and below the coal older or younger?