What does relative humidity measure? earth science

Which medullary index indicates a human hair? a. 0.653 b. 0.733 c. 0.516 d. 0.256

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 organelle pictured is found in cells of and is theorized to have once been an independent organism.