Q: What do most organisms eat in the profundal zone of a lake? Choices: - fresh organisms - algae organism - fish waste - dead organisms A:
dead organisms

Q: What type of waves start when a source of energy causes a disturbance in the medium? Choices: - fluid waves - mechanical currents - magnetic waves - mechanical waves A:
mechanical waves

Q: Q: What is the outermost occupied shell of electrons in an atom. Choices: - Inner Shell - radiative shell - modular shell - valence shell A:
A: valence shell

Question: Q: The hamstrings flex the leg, whereas the quadriceps femoris have what effect? Choices: - contract - stabilize - no effect - extend A:
Answer: extend

*Question*
Q: What is a measurement of the amount of variation of the species in a given area called? Choices: - ecosystem - population - degradation - biodiversity A:
**Answer**
biodiversity

(Q).
Q: The migration of what familiar coastal landform involves saltation and gravity? Choices: - volcanos - lakes - rivers - sand dunes A:
(A).
sand dunes