Q: What is the minimum depth in the aphotic zone? Choices: - 150 meters - 450 meters - 10 meters - 200 meters A:
200 meters

Q: What is the name for a series of changes in the reproductive system of mature females that repeats every month on average? Choices: - periodic table - urinary cycle - puberty - menstrual cycle A:
menstrual cycle

Q: Q: What type of weathering causes the minerals in a rock to change? Choices: - toxic - natural - artificial - chemical A:
A: chemical

Question: Q: What is described by the concentration of hydrogen ions in a solution? Choices: - neutrality - hydrogeny - oxidation - ph A:
Answer: ph

*Question*
Q: What is the basic unit of structure and function in all organisms? Choices: - the atom - the neutron - the electron - the cell A:
**Answer**
the cell

(Q).
Q: The magnitude of the momentum vector is the product of what two properties? Choices: - acceleration and speed - work and speed - volume and speed - mass and speed A:
(A).
mass and speed