At its carrier sites a hemoglobin molecule can combine with?

A: oxygen, carbon dioxide and carbon monoxide

B: oxygen, carbon dioxide and nitrogen

C: oxygen and carbon dioxide

D: oxygen and carbon monoxide

The function of the eardrum in the middle ear is to A. vibrate with the frequency of the received sound. B. collect the sound waves. C. carry the sound energy to the brain. D. amplify the received sound.

At which of the below boundries is a sea floor destroyed? Convergent Divergent Transform

Which feature of the lung cell allows oxygen to pass through quickly? Choose one answer. A: It is thin B: It has a large nucleus C: It has many mitochondria

When scientists say that a theory can never be proven, what are they actually saying?

What circumstances are best for fossils to form? Select all that apply. Rapid burial absence or limited oxygen supply undistrubed by geological forces involve heat and pressure

Early microbial ecologists knew that hydrogen gas is oxidized in soil and that ammonia is oxidized in sewage. How did these scientists determine that microbes are responsible for these ecological reactions? Choose one: A.

If more genes for less arm hair are passed on more frequently after several generations will people have more or less arm hair?

What kind of tissue is the precursor of long bones in the fetal skeleton?

Why are old rocks rare on the ocean floor

What is a storage form of carbohydrate energy?