What is the role of T-cells in the humoral immune response? A)
Helper T-cells are converted to B-cells following clonal selection,
B)
The B-cells are activated to produce antibodies following antigen
recognition.
Effector B-cells undergo clonal expansion after receiving a signal from
memory T-cells.
D)
The B-cells are activated after receiving an interleukin signal from an
effector T-cell.

answer; ///i believe the correct answer is (aids) acquired immune deficiency syndrome;

if the type of the food available changes, then the frequency of beak types will change, because birds with beaks more suited to the available food will be more successful over time.

igneous rocks which formed by the crystallization of magma at the surface of the earth called extrusive rocks. they are characterized by fine-grained textures because the rapid cooling at or near the surface did not provide enough time for large crystals to grow.