Are the concentrations of any of the four possible phosphate species negligible?.

explanation:

crosscutting concepts have application across all domains of science. as such, they are a way of linking the different domains of science. they include patterns; cause and effect; scale, proportion, and quantity; systems and system models; energy and matter; structure and function; and stability and change.

answer by yourhope:

how do models compare to real-world objects?

d. most models represent a real-world object in a simpler way.

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with this one i know the answer in craters one reason i looked it up and i learned about it there is my evidence