Answer:
Explanation:
Helium is the second most abundant element in the universe, but here on earth, it's rather rare. Most people guess that we extract helium from the air, but actually we dig it out of the ground. Helium can be found in certain parts of the world, notably in Texas, as a minor component in some sources of natural gas.
Helium is generated underground by the radioactive decay of heavy elements such as uranium and thorium. Part of the radiation from these elements consists of alpha particles, which form the nuclei of helium atoms. ... Helium can also be produced by liquefying air and separating the component gases
When the gas contains more than about 0.4% helium by volume, a cryogenic distillation method is often used in order to recover the helium content. Once the helium has been separated from the natural gas, it undergoes further refining to bring it to 99.99+% purity for commercial use.
Answer:
D
Explanation:
I got it wrong and it showed the answer :))) hope it helps
Answer:
Some animals have pouches to carry babies.
The babies are warm and are also protected from danger in their mother's pouch. Some animals have pouches to carry babies. Kangaroos are called marsupials because they have a special pouch for their babies.
Explanation:
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Answer:
directing the synthesis of proteins necessary for proper cell function.
Explanation:
The nucleic acids include DNA and RNA. The instructions on DNA are transcribed into messenger RNA. Ribosomes are able to read the genetic information inscribed on a strand of messenger RNA and use this information to string amino acids together into a protein thus nucleic acids directs the synthesis of proteins necessary for proper cell function.
Answer:
B. Molecules are moved against the concentration gradient.
Explanation:
Due to the higher concentration of the molecules of one of the sides than the other,in order to move molecules from the side with higher concentration of molecules to the side of lower concentration of molecules which is against the movement of molecules across the membrane, energy must be applied i.e atp.
