The main function of the human respiratory system is to

Question 4 options:

A. Produce carbon dioxide as a waste product.

B. Obtain oxygen out of the atmosphere.

C. Remove nitrogenous waste from the blood

Which blood vessels have the thinnest walls and why

If you walk out into the ocean, you will see that the land covered by ocean water slopes very slowly away from the coastline. This gently sloping land close to the shore is known as the continental shelf.

Explain how energy from the sub is transformed and passed from one organism to another

What can a hypothesis become if it is supported by repeated experimentation? a. a scientific theory b. an experimental group c. a scientific method d. a peer review

Biologists have classified the elephant shrew, a small mole-like mammal, with other shrews of similar size and body shape.

Which explains how the Great Lakes cause excess snow on the eastern edges during the winters? A. As the winds blow west over the lakes, they warm, thereby leaving the cooler air mass to drop snow on the eastern shores. B.

In which phase of mitosis are chromosomes first seen as a result of chromatin coiling?

What is the developmental reason that hCG is a good indicator of pregnancy

In order for an electrical message to be sent from the axon of one neuron to the dendrite of another neuron, it must transverse a space called the

Which of the following is a scientific species designation?