Which stage of sleep comes before rem sleep?

The lock-and-key mechanism refers to? A.) The complementary shapes of an enzyme and a substrate. B.) the attractive forces between an enzyme and a substrate. C.) the ability of an enzyme to lower the activation energy of a reaction. D.

Which factor does not affect the apparent brightness of a star?

One way that fossils form by the dead organism's soft tissue is sediments such as sand. OA) repaired OB) replaced OC) preserved OD bonded .

Which theme of biology explains the modification of an organism's parts to adapt to its habitat? Interdependence in nature Relationship of structure to function Continuity and change

What does it mean to be less/more dense?

A mother sleeping in the middle of the night nevertheless responds when she hears her 2-year-old daughter crying in the adjacent bedroom. This indicates that the mother possesses:

How can farmers keep topsoil on their land? check all that apply. a. close their gates b. keep plants growing c. plant trees to shield fields from the wind d. do not plow when extremely heavy rains are expected?

Measures how much matter is present in a substance

How is artificial selection similar to natural selection?

Which of these is a distinguishing characteristic of terrestrial habitats? O A. Plant life O B. Presence of oxygen O C. Salinity levels O D. Human presence