Which gas passes into the blood from the alveoli? And which gas passes out of the blood into the alveoli? Please help me

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

The structure that houses the cells genetic information.

Which material is commonly used as a culture medium for living cells