biology and botany?

[polecat.hockey]

1. A group of mussels of a particular type living together on a rocky beach is an example of a(n)
a. population. c. individual. e. a party waiting to happen.
b. community. d. ecosystem.
2. A diver in northern California, where the water is murky, sees a brown sponge at 20 m (62 feet). On vacation in the tropical Caribbean, with clear water, he sees the same sponge at an equal depth--but it appears to be bright red. Why?
a. The murky water in California was less transparent, so red light was absorbed.
b. More blue light penetrated in the Caribbean than in California.
c. Cold water is less transparent than warm water.
d. There is more sunlight at the surface in the Caribbean.
3. In primary production
a. oxygen utilized by animals is less than the oxygen produced by plants.
b. carbon dioxide is released into the water.
c. oxygen is utilized by plants.
d. organic matter is produced in excess of organic matter broken down by respiration.
e. proteins are manufactured by animals.
10. Which nutrients are the most important for plant growth in the sea?
a. oxygen & nitrogen d. sodium & chloride
b. phosphorus & nitrogen e. varies with location
c. oxygen and carbon dioxide e. varies with location

[science teacher]

1. population
2.a
3.c
10 c