Which is an immune response?

A: The iris of the eye narrows when the eyes are exposed to bright light
B: langerhans cells transport harmful substances to white blood cells
C: muscles under the skin contract rapidly to adjust the body’s internal temperature
D: T cells signal B cells to adjust the pH of the blood

Would really appreciate it, i have an idea but not completely sure

What type of genetic drift would be simulated if all the beans that were not selected died out?

Scenario #2 in 2001, a population of 2,500 poison dart frogs lived in the amazon rain forest. due to increased deforestation, the population dwindled to 25 frogs in 2019. new government regulations were enacted in 2022, successfully putting an end to the deforestation of the amazon rain forest. once deforestation was stopped, the poison dart frog population was able to recover. by 2050, the population reached 8,000 frogs, of that population, 20 are homozygous recessive for being spotted (ss genotype). q2- ? q- p- p2- 2pq-