Fat; they store twice as much energy per gram
Answer:
D
Explanation:
Plant cells have chloroplasts to turn light energy into glucose through photosynthesis, but animals do not, since animals do not make their own food.
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.
Answer:
D. As the pH decreases, the number of surviving species decreases.
Explanation:
According to the table, there is only one species that survives a ph of 4.0 and 4.5 in the pond, while every ph value above that has multiple species that survive in its condition.
Answer:
I believe this is a pacemaker. It controls the heart when it starts to fail.
Explanation:
