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.

Based on the data in your tables, did the light-colored moths have a higher or lower survival rate after the industrial revolution?

The tasmanian devil, a marsupial carnivore, is facing extinction due to devil facial tumor disease (dftd) which causes bulging cancerous lumps and lesions to erupt around the face and neck — often causing enough deformation to make seeing or eating difficult. dftd has evolved into a contagious cancer, a trait that is unique among cancers. devil mating behavior involves biting around the head and neck, allowing cells from one individual — especially cells from the crumbly dftd tumors — to be transferred to the wounds or face of a new individual. this marsupial was once found across australia, but sea levels rose, isolating the tasmanian population, while the australian population went extinct. what would be an outcome of genetic isolation that is likely to have impacted the spread of dftd? a) reduced territory puts diseased individuals in greater contact with non-diseased ones. b) inbreeding results in less variation in facial features so the cancer is generally fatal. c) genetic isolation has made it difficult for scientists to develop a vaccine against dftd. d) the lack of genetic variation in the immune system of tasmanian devils minimizes resistance to the disease.

Based on the topographic map of mt. st. helens, what is the contour interval of the volcano about height is 2,950 m?