Organisms at the of an energy pyramid have the
amount of energy available to them compared to the organisms at other levels.
A. top; most
B. top; least
C. middle; least
D. bottom; least
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Check all that apply diatoms are marine algae that have a shell made of silica, what are some of the uses of the silica shell after the diatoms die? 1.the shells make up the diatomaceous earth used in filters 2.it can be used as an ingredient in abrasives 3.they are used in food products 4.the shells can be used in some insulating materials

'which of these statements about the scientific method is not true? all experiments must follow the same number of steps in the procedure. experiments may be repeated several times. some unexpected results can be beneficial. experimental results may or may not support the hypothesis.

Chloroplasts and bacteria are in size. a. similar b. at different ends of the size range c. exactly the same d. none of these