The waxy cuticle of leaves, skin and exoskeleton of insects are examples of mechanical aspects of immune system which protects from infection. The skin and respiratory tract secrete antibacterial peptides which acts as chemical barrier to protect from infection.The glands also produce many cells which are needed immune system. The spleen is such an example. It produces antibodies which fight infection. Leukocytes are the phagocytes which engulf microbial cells and large particles through phagocytosis process. Non-specific immune system presence since birth. It is first line of immunity against invading organisms.Non-specific immune system treat all foreign substances equally. Whereas, specific immune system is a second line of immunity composed of special cells which prevent pathogen growth.
its new to our body. Saying that, it dosen't know how to fight this off, but once you get the coronavirus, you are ammune to that type because then your body knows how to fight it off. :)
<span>enzyme that binds with the promoter on DNA and then moves along the DNA strand opening up the DNA helix in front of it and then aligning the appropriate RNA nucleotides and linking them together i would have to say C. </span>
