Which beat describes how ocean currents are created

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

Long term exposure to waves can cause sunburns and skin cancer.

What best describes the dropping height of a ball that bounces back up to a height of 45 cm