What trades information during crossing over

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 many years would it take the atlantic ocean to grow 500 centimeters? show your work.

Based on the topographic map of mt. st. helens, what is the contour interval of the volcano about height is 2,950 m?