It means that all living things have dna
The circulatory system helps the excretory and digestive system do their jobs because the waste from the blood in the circulatory system is eliminated from the body through the excretory system, and the nutrients absorbed by the digestive system are transported through the blood.
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Explanation:
the importance of oxygen for animals, researchers suspected that a sudden increase in the gas to near-modern levels in the ocean could have spurred the Cambrian explosion.
Answer:
basically every living thing breathes oxygen O2 and exhales carbon dioxide CO2
Explanation:
So orcas use O2 and produce then CO2.
Answer:
This is called a glycoprotein.
