Hierachy is a series of ordered groupings
Answer:
Producers are always at the beginning of a food chain. Producers begin every food chain because they can make their own food.
Answer -
T-Cell - White blood cell = Fight off Intruders in the body
B-Cell - Macrophages = Creates Antibodies against antigen.
Cell Differentiate - Stem Cells = My favorite cell of all time in animal because they can turn into almost any cell like neural, signaling, euthyroid. Etc
The answer is heavy/dense
