1. The cells specialize.
A crab has an exoskeleton.
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"Answer DThe outermost layer of old epidermal cells are sloughed off and replaced every 15 to 30 days. The sebaceous glands secrete sebum which maintains the skin pH between 3 and 5. Bacteria which metabolize sebum live as opportunistic pathogens on the skin and cause skin infections."
Microorganisms such as bacteria are being genetically engineered to decompose toxic waste into non-toxic products. This is referred to as "biomediation"
Answer:
It's commonly believed that the dodo went extinct because Dutch sailors ate the beast to extinction after finding that the bird was incredibly easy to catch due to the fact it had no fear of humans.
Explanation: