Why are living organisms such an important component of soil? What will be an ideal response?


Concepts to Consider: Bacteria and fungi--decompose organic matter, thus releasing
essential minerals into soil. Earthworms--dig tunnels that aerate soil; deposit castings on
surface of soil, thereby bringing nutrients from deeper layers to upper layers. Ants--aerate
soil through the construction of tunnels and chambers; bring food, which decays and
contributes to organic matter in soil, back to their nests.

Biology & Microbiology

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Some invertebrates do not have special respiratory organs and rely on __________ exchange, diffusion

of gases across the body surface. Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

Which of the following best supports the hypothesis that the difference in leaf color is genetically controlled?

(A) The number of yellow-leaved seedlings in dish A on day 7 (B) The number of germinated seeds in dish A on days 7 and 14 (C) The death of all the yellow-leaved seedlings (D) The existence of yellow-leaved seedlings as well as green-leaved ones on day 14 in dish B

Biology & Microbiology

Explain the significance of the 1950s experiments of F. C. Steward.

What will be an ideal response?

Biology & Microbiology

Please select the factors below that must be considered in managing a patient's antimicrobial drug therapy.

> Therapeutic index of the antimicrobial drug > Potential allergies or toxic reactions > Route of administration of the drug > Source of the drug > Cost of the drug > Patient compliance

Biology & Microbiology