The mass number of carbon-12 is twelve as it contains 6 neutrons and 6 protons. Likewise, carbon-13 isotope contains 7 neutrons and 6 protons, while carbon-14 isotope contains 8 neutrons and 6 protons.
Answer:
A gland that secretes hormones
Explanation:
Exocrine glands are the tissue which can secrete organic compounds in the human body and secrete them through the process of exocytosis. The exocrine glands secrete the secretion through the ducts into the body cavity. They do not secrete the blood into the bloodstream but in the body cavities.
In the given question, the characteristic which is not performed by the exocrine gland is the secretion of hormones as they are produced by the endocrine glands which strictly pour them into the bloodstream.
Thus, the selected option is the correct answer.
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.
i think they are called that, Mimicked genes
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<span>A. </span>Mechanoreceptor–temperature </span>
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<span>B. </span>Photoreceptor–chemicals </span>
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C. Pain receptor–tissue injury
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<span>D. </span>Chemoreceptor–pressure </span>
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