In the ecosystem shown here, what represents a producer? A) air B) a tree C) a giraffe D) a mountain

6. who discovered the three-dimensional structure of dna in 1953?

What happened during the Cambrian explosion? A. groups of dinosaurs began to evolve into the ancestors of modern birds. B. animals evolved a variety of complex body parts. C. early chordates began toj appear. D.

Explain why almost all organisms depend on photosynthesis

The following list contains possible combinations for pea plant seed color. Yellow (Y) is a dominant trait, and green (y) is a recessive trait. Choose the combination (s) that would result in a plant with yellow seeds. Select all that apply. A. YY B.

What caused the tree trunks to turn from light to dark in color?

Simpler communications and decreased miscommunications are associated with

What is the signal for a vesicle storing peptide hormone to move to the plasma membrane and release contents of vesicle? a. Activation of an integrin receptor b. Activation of a g-protein c. Activation of an enzyme linked receptor d.

Which factor causes the greatest increase in an area's flash flood risk?

A body weight that is 10 to 15 percent below the desired weight is

How should we properly understand human nature?