3. A freshwater ecosystem has a sandy bottom with few rocks. Invertebrates and algae live near the bottom among the rocks. Plankton live at various depths in the water. Different species of fish feed on algae, plankton and other fish. Which of these is an abiotic factor in the ecosystem? A. temperature of the water B. the number of species of algae
C. amount of food available to the fish D. the amount of plankton
Correct
Incorrect answers and why:

i think the answer is b.

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what do the different brain waves do?

explanation:

brainwaves are produced by synchronised electrical pulses from masses of neurons communicating with each other. brainwaves are detected using sensors placed on the scalp. brainwave speed is measured in hertz (cycles per second) and they are divided into bands delineating slow, moderate, and fast waves.

b) the inside picture would look at a very high temperature in a very low ph