Answer:
D)
Explanation:
Because the independent variable stays the same for all the people in the experiment
Plants use the sun to produce food then animals eat the plants for food
Always remember quadrilateral means 4 sides
Amino Acids. A polypeptide IS a protein.
After the macrophage fails the Helper T Cell stimulates the B cells (create antibodies) if pathogen is extracellular and Cytotoxic T Cells (killer T cells, release perforin) if pathogen is intracellular. Once the pathogen is killed the B Cells create Memory B Cells and the Killer T Cells create memory T Cells.
<span>Hope that's helpful.</span>
