It seems that you forgot the answer choices, but lucky for you, I know the answer..
Answer: creating skin tissue by combining cells from different cell lines
The thread of protien called A. Fibrinogen helps form clots.
<span> (3) contain structures that perform life functions</span>. Although unicellular organisms have less capacity to survive than multicellular organisms, they contain internal structures or organelles that perform different functions to maintain stability and survival.
This is because the melanocytes are located in the stratum basale. Lighter-skinned people usually have low basal levels, and exposure to UV radiation causes an increase which makes skin darker.