Write a short paragraph that uses the following key terms: ecosystem productivity, gross primary productivity, net primary productivity, energy, biomass, energy transfer efficiency, and trophic level.

The observations of hooke and van leeuwenhoek documenting the existence of microscopic cells formed the basis of what important theory? a. the cell theory stating that all living things are composed of cellsb. the theory of spontaneous generation, which held that life forms could arise spontaneouslyc. the theory of chemotherapy, or use of antimicrobials to destroy pathogenic organismsd. the germ theory of disease and causative agents

How does the nervous system affect the excretory system?

What's the waste product of electrons and pyruvate combining in fermentation?