Ecologists often use modeling, instead of field studies, because it
question 18 options:

allows them to control all of the variables involved.

them collect more samples.

is less expensive than working in the field.

lets them study many organisms at once.

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hydrogen is a compound or a single element and a element is a pure substence that cannot be separated into simpler subtances

clorine is a compound its a chemical substance that forms when two or more different elements combine

so both hydrogen and clorine are compounds