What instrument was essential to the development of the cell theory ( i need a verified answer)

Name the following: (a) category of pathogen that causes diseases, like common cold and mumps. (b) the microorganism that requires a host to produce.

Biomass can be used to generate electricity. biomass relies heavily on agricultural crops. plants release carbon dioxide and water in combustion. plants use photosynthesis to originally generate the energy that is needed. the chemical energy of these plants all started with what energy source?

Adigestive system that is a series of tubes beginning at the mouth and ending at the anus is a digestive system.