can someone help me out with these 2 biology multiple choice questions?

Vaccines provide immunity to diseases for some period of

time (usually years) because:

A. They introduce antibodies that stimulate antigen

production and effective B-cells are produced that stay in

your body for years and provide immunity

B. They stimulate the innate immune system to produce

antibodies

C. They stimulate the production of more B and T cells which

in turn lead to long term immunity

D. Vaccines introduce an antigen that ultimately causes the

production of antibodies by B cells that stay in your body

for years

E. Vaccines contain the DNA of viruses that get into your

cells and stimulate the production of antibodies that fight

off infections

In a single population of water snakes on an island

in Lake Erie, some snakes have 19 black bands on

their back, some have none but most have between

5-10 bands. Originally, how did this color variation

arise in the population?

A. Through natural selection

B. The bands help snakes survive better on rocks

C. Through random mutations

D. There is no way to know

1 Answer

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  • Anonymous
    5 years ago
    Favorite Answer

    Vaccines provide immunity to diseases for some period of

    time (usually years) because:

    A. They introduce antibodies that stimulate antigen

    production and effective B-cells are produced that stay in

    your body for years and provide immunity

    In a single population of water snakes on an island

    in Lake Erie, some snakes have 19 black bands on

    their back, some have none but most have between

    5-10 bands. Originally, how did this color variation

    arise in the population?

    A. Through random mutations

    I think that's the answer because it says "most" have between 5-10 bands and this is one single population so it can't be explained by A or B.

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