How many egg cells (ova) are produced in females when one diploid cell enters gametogenesis?

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

Mrna decodes information from the original dna master plan to build proteins in the during the process of ribosomes.

Several billion years ago which gas was the least prevailant in the atmosphere