Which is an external stimulus?

A thirst

B heat

C pain

D hunger

What causes the movement of electrical current in the circuit within the divide shown in the diagram

What is an energy riched compound needed by organisms?

During photosynthesis, light energy becomes what?

Describe how each factor contributes to the genetic diversity of sexually reproducing organisms

What are characteristics of absorption spectra? Check all that apply.

Which process occurs only in autotrophic organisms?

Polymers are made of individual subunit called

What are the exergonic reactions that provide living systems with energy (give two examples) ?

The roots of a plant are usually located underground and composed of which of the following tissue systems?

You are excavating a Native American human burial site which contains both males and females. After obtaining permission from current Native American tribes believed to have descended from these people, you analyze the bones.