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.
We all have a common ancestor hence we have some form of a universal genetic code
A is the correct answer I belive
Answer:
Global warming is caused by greenhouse gasses. I am 100% sure.
PLEASE GIVE BRAINLIEST AND WATCH OUT BEHIND YOU
Chemosynthesis is the biological conversion of one or more carbon- containing molecules.