The point on earth's surface directly above an earthquakes focus (hypocenter) is called the epicenter.
By the late 1830s, botanist Matthias Schleiden and zoologist Theodor Schwann were studying tissues and proposed the unified cell theory. The unified cell theory states that: all living things are composed of one or more cells; the cell is the basic unit of life; and new cells arise from existing cells.
C. A buildup of lactic acid in the tissues.
Answer: Excretory
Explanation: My grandpa went through this recently and I had to learn all about it. :(