first left (up) trachea
first left (down) diaphragm
right (up) bronchiole
right (down) alveolus
Explanation:
Adaptations generally occur in order to increase the fitness and thus survival of organisms. By being able to adapt to the changing environment, organisms are better able to survive and reproduce. ... Many people are under the impression that species require thousands or even millions of years to adapt.
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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.