When people used stone tools,
The in-between period of time when the first man appeared and when man developed a writing system. Or the period of time before man became literate.
Cephalization refers to the concentration of nerve cells and sensory organs at the anterior (head) end of the body.
Answer:
The correct answer is B.
Explanation:
Mitosis usually results in two identical daughter cells, whereas meiosis results in four sex cells.
The erythema response of skin to ultraviolet radiation (UVR), i.e., the sunburn reaction, has long been known to correlate with skin color. Dark-skinned individuals are able to tolerate a longer sun exposure than light-skinned individuals. Skin color in humans is mainly determined by the quantity, quality, and distribution of the complex biopolymer, mel~ni1_1, and its organized form, the melanosome (1,2}; melanm IS thought to protect skin from the deleterious effects of UVR.
Answer:
acceleration = force / mass
Explanation:
