What is it called when changes occur in an ecosystem that already exists? *

a. primary succession

b. secondary succession

c. pollution

What is the texture and consistency of the dna? 2. why did we use a salt in the extraction solution? 3. is the dna soluble in the aqueous solution or alcohol? 4. what else might be in the ethanol/aqueous interface? how could you eliminate this? 5.

What causes ocean water to be warmer at the equator than farther north? a. Sunlight hits directly so the warmth is more concentrated B. Cold water currents move from the poles to the equator C. Seasonal winds push warm water away from the coasts D.

Which of the following is a principle of the fluid mosaic model of cell membrane structure? a. Phospholipids consist of a polar head and a nonpolar tail made of three fatty acid chains. b.

Plants show turgor pressure when cells are losing water from their water vacuoles. cells contain water vacuoles that are full of water. water is being used up in photosynthesis. water is being evaporated from the leaves.

What was the conclusion that Avery and other scientists discovered?

A nurse is instructing a patient receiving a cholesterol-lowering agent. which information should the nurse include in the patient education?

What is the impact of a nonsence mutation? A) No effect on the protein. B) The creation of a new amino acid. C) It results in epigenetics. D) A stop codon is formed.

A stalked, sessile marine organism has several feathery feeding structures surrounding an opening through which food enters. The organism could potentially be a cnidarian, a lophophorate, a tube-dwelling worm, a crustacean, or an echinoderm.

All cells within an organism will have the same number of chromosomes except the gamete. a. True b. False

What are the steps of the food chain that includes insect-eating birds.