Answer:
c. independent variable
Explanation:
#<em>c</em><em>arryonlearning</em>
Because there are too many sex chromosomes I think
Answer:
secrete a cytokine that triggers apoptosis
Explanation:
Cytotoxic T cells secrete granzymes and perforins when targeting cells. Additionally they secrete cytokines such as IFN-, TNF-α and TNF-β that act to activate macrophages and help kill infected cells.