What happened when griffith injected mice with the harmless, r-strain bacteria alone?
a. the bacteria transformed.
b. the mouse lived.
c. the mouse died.
d. the bacteria died.

Option B, The mouse lived.

Explanation:

In Griffith's experiments three major observations were made -

a) Injecting the mice with S - strain bacteria - The S - strain bacteria's were infected bacteria's and hence when these S -bacteria's  were injected into the mice ,they were killed due to infection.

b) Injecting with R -strain harmless bacteria - These being harmless did not affected the mice and hence they remained healthy and alive

c) Injecting heated S -strain into R -strain infected mice - These mice also developed the disease due to virulent remains of heated S -strain affecting the R -strain.

Hence, option B is correct

what statement best describes the difference between the sympathetic and parasympathetic nervous systems?

the sympathetic nervous system prepares the body for intense physical activity and is often referred to as the fight-or-flight response. the parasympathetic nervous system has almost the exact opposite effect and relaxes the body and inhibits or slows many high energy functions.

the answer is b. glad to .