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.
A mystery organism is non living
Answer:
Evaporation
Explanation:
The water will gradually evaporate(the process of a liquid becoming a gas).If the temperature reaches the water's boiling point, it will quickly evaporate and form steam.
