Use arrows to demonstrate the flow of oxygen-rich and oxygen-poor blood through the circulatory and respiratory systems. Use one color to illustrate oxygen-rich blood
and another color to depict oxygen-poor blood

What percentage of light hits earth's surface directly?

How are proteins and nucleic acids related? they both provide energy. they both carry genetic information. the structure of proteins is determined by nucleic acids. the subunits of nucleic acids are also the subunits of proteins.

Ascientist is conducting an investigation that involves water, silver, carbon dioxide, and oxygen gas which group of statements best describes all of the materials he is using in the investigation?