Answer:
c. A piece of mesh, keeping some things out and letting some things in
Explanation:
The cell membrane of a cell is described as "selectively permeable". Permeable means things can go through it, but the word selectively is the important part. It lets things in, but it also keeps things out. This way it can regulate the different things that go in and out of the cell. It allows certain molecules that provide the cell nourishment and other things that help it function, and at the same time, it allows waste to move out of the cell. Not all needed molecules can go through the "mesh-like" membrane, that why some of them need help.
<span>Answer: Innate; Adaptive
Explanation: The innate immune system is a nonspecific immune system which provides a general defense against pathogens and mostly fight against bacterial infections. The adaptive immune system are also called specific immune response where particular agents like the so-called antibodies target very specific pathogens that the body has already had contact with. But both the innate and adaptive immune systems complement each other in any reaction to a pathogen or harmful substance, and are closely connected with each other.</span>
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Life processes of animals
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