Explain why a hypothesis has to be written objectively?

Eristics do scientists use to distinguish between organisms in different kingdoms

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

Vessels draining the myocardium of the heart, open primarily ,into which chamber?