You're right. The Upper Mantle is directly under the Crust. Hope this helped! =^-^=
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Answer:
peptide antigens by MHC class II molecules
Explanation:
Helper T cells are activated by peptide antigens by MHC class II molecules. These antigens express on the surface of antigen-presenting cells (APCs). After activation, the T helper cells divide and secrete cytokines to assist the immune response.
Answer:
the chromosome are found in the nucleus of a body cell in pair
Answer:
A a living thing that has undergone a mutation.
Explanation:
