I don’t really know sorry
The first line of barrier that support the immune system by the invading microorganisms is formed by the skin and the mucous membrane.
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What is immune system?</h3>
A network of biological processes called the immune system guards an organism against disease.
<h3>How do skin and mucous membrane support the immune system?</h3>
The skin acts as the first line of defense and has specialized immune cells that help prevent the microorganisms from entering the body.
The mucous membrane which is more sensitive and lines up the internal organs of the body can sense and eliminate the microorganisms thus helping the immune system.
Learn more about the immune system with the help of the given link:
brainly.com/question/13257880
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<span>Endoskeletons are bony forms on the inside of the body of an organism. In these cases, fish scales and bones on a human are inside the skin. These would be endoskeletal in nature. Echinoderms with plates and arthropods with appendages would be examples of exoskeletons.</span>
<span>Prokaryotic cells to prokaryotic organisms to eukaryotic cells to eukaryotic organisms.
There are a lot of created theories in which biologists engaged themselves to explain such phenomenon that occurred thousands of years ago, and experts say such study is hard to replicate, the start of prokaryote cells. Prokaryotes were said to be the first organisms that existed and were able to exhibit photosynthesis that produced oxygen that spread across the atmosphere. Hence, consider the Theory of Spontaneous formation of organic moleculeswhich suggests that the early earth had less to none oxygen. Thus, the atmosphere was abundant with the gases, CO2 and N2 with some other small amounts of H2, H2S, and CO. Hence, in Stanley Miller’s experiment when electrical sparks or “lightning” came in contact with these gases, the newly formed mixtures of CH4, NH3, and H2 were catalyzed. With these newly formed gases in interaction with H2O came the first synthesized some amino acids that compromised the earliest organic molecules which evolved to macromolecules, to be organelles of a cell. Which in the latter macromolecules are in today, maybe have been before the early nucleic acids (able to replicate) or proteins of these early cells.</span><span>
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