<span>pernicious form of anemia</span>
Answer:
A producer. For example in a common food chain, grass->grasshopper->mouse->snake->eagle. The grasshopper eats grass which is a producer so if there aren't anymore insects like grasshoppers, then the grass grows more.
(15) Label 1 is D
(16) Label 2 is A
(17) Label 3 is B
(18) Label 4 is C
