Which protein serves as a chemical messenger?

hemoglobin

actin

myosin

insulin

How would scientists know that there is life existing outside of Earth? What do they use?

What three domains are accepted by most scientists

The function of tight junctions in epithelial tissue is to increase the surface area; a. increase the strength and integrity of the tissue layer b. increase the solute uptake in the tissue c.

Under what conditions does n eclipse occur? A. Sun blocks the moon B. moon blocks Earh C. Sun blocks Earth D. moon blocks the sun.

Which factor can decrease the kinetic energy of an object? A. Increase in speed B. Decrease in speed C. Increase in temperature. D. Decrease in volume

How is each sense organ able to transmit a nerve impulse?

Which of the following occurs when organisms interact with other living things and their environment

Why do clouds tend to form around 3:00 P. M. and 6:00 A. M.?

How does darwin's theory of evolution by natural selection explain why some organisms become extinct?

Definition of control group