Answer:
Hydrogen ions
Explanation: pH is the concentration of hydrogen ions (H+) in a given solution. A pH of 1 means there are a lot of hydrogen ions and a pH of 14 means there is a very small concentration if them.
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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I'm not sure what the options were, but a cell would die if it didn't have enzymes. :)
1 geosphere is the earth's solid rock, 2Without the geosphere it wouldn’t be possible for humans to live on any planet because there would be no solid hard ground.
3The geosphere is 4.6 billion years old.
4Piling up our waste in landfills affects the geosphere. Yeah I know we are terrible...
5 the geosphere includes rocks and minerals
6 with no geosphere there wouldn’t be lakes rivers etc...
7 the geosphere is with a radius of 6,357 kilometers
8 we all need the geosphere to live
Hope this helped!!!