Carbon is found in fossil fuels such as petroleum (crude oil).
Carbon is found in soil from dead animals and decaying animals.
Carbon is found in the biosphere stored in plants and trees.
A Joint<span> is where two adjacent bones or cartilages or combinations thereof meet. They provide the mechanism that allows the </span>body<span> to move. They are classified according to their degree of movement as </span>movable<span>, partially </span>movable<span> and immovable </span>joints<span>.</span>
<span>The trait that is ancestral to all chordates is the presence of a notochord...the others are gill slits and nerve chord</span>
Answer:
Innate immunity is a non-specific immune system which provides defence against any pathogenic microorganism in early stages. It includes physical barrier such as skin, chemical barriers such as saliva, tears, et cetera, phagocytic cells such as macrophages, et cetera.
Acquired immune system is the one which develops after exposure to pathogen or antigen. It is highly specific in nature. It includes B-lymphocytes and T-lymphocytes. It includes the production of antibodies.
Vaccines are used to develop acquired immunity in people. The process is termed as vaccination or immunisation. Heat-killed or weakened pathogen or antigen is inserted into a person after which a person develops antibodies and memory cells against that pathogen or disease. So, the immune system acts more vigorously against that pathogen in secondary infection.
Thus, a person becomes immunised.
