Match the following terms to the proper characteristic: nucleus, proton, electron, neutron, and subatomic particles. Some terms may be used more than once and some characteristics may use multiple terms.
Has almost no mass
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Protons, electrons, and neutrons
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Found in the nucleus
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Center of an atom
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In constant motion
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eloinama

Explanation:

b. the carbon cycle ensures living things have a source of hydrogen

blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. as the ventricle contracts, blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs where it is oxygenated.