All deep sea trenches are located a, in the middle of the mountain ranges
b. at the edges of continents.
c. near chains of active volcanoes.
d. none of these.

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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

Gene expression is the activation of a gent that results in a question 1 options: protein dna mitochondria