Helper T cells become activated by interacting with antigen presenting cells. and the second blank space is either cytotoxic t cells or B cells
B. its false it's the other way around gametes are produced by gametangia :)
Answer:
Shows comparative homologous structures among different species.
Explanation:
The picture is showing the bones of forearms of different species. Structurally they appear the same but they serve a different purpose.