Which form of natural selection on polygenic traits results in the creation of two distinct phenotypes? A. Directional selection B. Disruptive selection C. Stabilizing selection D. Artificial selection

Which of the following is an adaptation to permafrost? a. retention of dead leaves b. dense hairs c. shallow roots d. waxy leaves

Which of the following is the least likely mechanism for reducing the rate of gene transcription by a repressor? the repressor binds directly to the rna polymerase to block the closed-to-open transition at initiation.

RNA molecules control protein production in ribosomes. True or false

What happens to the energy in an ear of corn once a cow eats it? a. Most of the energy from the corn is available to a human who eats meat from the cow. b. The cow gives all of the corn's energy off as heat energy. c.

When microbial action during decomposition in aquatic ecosystems removes too much oxygen, the body of water experiences

How have humans caused damage and change to each of the earths spheres

Which statement describes an innate behavioral adaptation of an animal? Question options: wolves hunting for food one fish responding aggressively to another with a red belly dogs responding to "roll over" a pet parrot talking

The cellular process that eventually leads to increased genetic diversity is

Sound travels faster through what state of matter? liquid solid gas

A landscape region that has broad, u shaped valleys with polished and grooved bedrock was most likely formed by