Organisms must be able to adapt to a changing external and internal environment. an organism's ability to maintain a stable internal environment is known as homeostasis. how does a cell's membrane an organism maintain homeostasis? a. cell membranes control the substances that enter or leave cells. b. cell membranes use a large portion of the cell's energy supply. c. cell membranes protect the cell organelles from large doses of radiation. d. cell membranes directly control the temperature of the cell. the answer is a.

Barbara is converting 78°f to degrees celsius. first, she subtracts 32 from 78. what is the next step?

The empty trna moves off and picks up another matching amino acid from the cytoplasm in the cell. the anticodon of the trna, with its attached amino acid, pairs to the codon of the mrna, which is attached to a ribosome. this sequence is repeated until the ribosome reaches a stop codon on the mrna, which signals the end of protein synthesis. the ribosome forms a peptide bond between the amino acids, and an amino acid chain begins to form. when a second trna with its specific amino acid pairs to the next codon in sequence, the attached amino acid breaks from the first trna and is bonded to the amino acid of the second trna.

What is one way intensive agriculture can contribute to climate change? a. tree loss to agriculture increases earth's albedo b. livestock manure absorbs greenhouse gases c. large herds of livestock release greenhouse gases d. fewer trees are available to replenish petroleum stores appex