How is science based on observation used as evidence? How can this evidence be used?

When sodium chloride dissolves in water the sodium cholride dissociates into?

What is the number of cells produced in mitosis

Which of the following statements accurately defines epidermis? a. a thick protein fiber composed of the protein collagen b. hard, dense bone tissue found on the outer surface of a bone c. single layer of epithelial cells and the underlying basal lamina d. outer, protective layer of the skin composed of stratified squamous keratinized epithelial tissue