One reason cancer is so hard to immunize against is that it's not an antigen like bacteria or viruses. True or false?

The is a thin membrane that transmits sound waves into the middle ear.

Which is a personal reason for using tobacco

Melanocytes and keratinocytes work together in protecting the skin from uv damage when keratinocytes a. provide the melanocyte with a protective shield against abrasion b. maintain the appropriate temperature so the product of the melanocyte will not denature c. maintain the appropriate ph in order for the melanocyte to synthesize melanin granules d. accumulate the melanin granules on their superficial portion, forming a uv-blocking pigment layer