A bone fragment found in Africa has 75 C-14 atoms and 75 C-12 daughter atoms. How many half-lives have passed and how old is the bone

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