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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
According to the CDC, approximately 31.7% of the U.S. population has high low-density lipoprotein (LDL) or "bad cholesterol" levels.
There are major differences in the metabolism of morphine and the illegal drug heroin. Morphine mostly produces its CNS effects through m-receptors, and at k- and d-receptors. Heroin has a slight affinity for opiate receptors. Most of its actions are due to metabolism to active metabolites (6-acetylmorphine, morphine, and morphine-6-glucuronide).
Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.
Certain chemicals, after ingestion, can be converted by the body into cyanide. Most of these chemicals have been removed from the market, but some old nail polish remover, solvents, and plastics manufacturing solutions can contain these substances.
![Leafcutter ants carrying leaf fragments back to the nest where they will be processed to create a su](https://biology-forums.com/gallery/47/medium_33_09_09_11_10_15_38_1724111.jpeg)
![Standing at the head of the table, apply oil or lotion to the entire back with bilateral stroking. ...](https://biology-forums.com/gallery/33/medium_380798_23_08_17_3_43_18_331731783.jpeg)