An earthworm helps to break up soil so that the roots of plants may receive oxygen. This enriches the soil and provides food for other organisms. What do these characteristics describe about the earthworm? A. its community B. its ecosystem C. its habitat D. its niche

b) chemical ( the chemical breakdown of food is accomplished by enzymes. )

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im not intirely sure but i think the anwser is d relative humidity

it's diluted or concentrated

in a diluted solution, you can add a lot more solute but in concentrated only a little more can be added

dna is a set of a gene held together by a chemical bond