Carbon atoms are the basis for all life on earth. carbon atoms are found in all the molecules that make up living organisms—carbohydrates, lipids, proteins, and nucleic acids. why is carbon important in the earth’s ecosystems? a. carbon originates in sunlight. b. carbon is produced in the nitrogen cycle. c. carbon atoms are found in molecules of all living organisms. d. carbon atoms are found only in nonliving matter.

Carbon is compound of the organic complex molecules and has unusual ability to form polymers. Because of its tetravalent properties ( able to form four covalent chemical bonds), carbon is often bonded with many other elements, especially oxygen, hydrogen and nitrogen which enables this element to serve as a common element of all known life.

is C.

Explanation: took the test!

hope this helps!

Migirigi (:

the oxygenated blood then leaves the lungs through pulmonary veins, which return it to the left heart, completing the pulmonary cycle. this blood then enters the left atrium, which pumps it through the mitral valve into the left ventricle. from the left ventricle, the blood passes through the aortic valve to the aorta.

deoxygenated blood leaves through the right ventricle through the pulmonary artery. from the right atrium, the blood is pumped through the tricuspid valve (or right atrioventricular valve), into the right ventricle.

the "dirty dozen" chemicals banned in an international treaty are formally known as persistent organic pollutants, or pops. the united nations environment program provided this background on what they are and what they can do to humans and wildlife.

i hope this