Which is not a key abiotic factor in marine ecosystems?
a. water temperature
c. amount of sunlight
b. water depth
d. amount of plankton

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