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

water is a polar molecule. a chemical bond is a force of attraction between atoms or ions. bonds form when atoms share or transfer valence electrons. atoms form chemical bonds to achieve a full outer energy level, which is the most stable arrangement of electrons. so, false

explanation:

in h2o molecule, two water molecules are bonded by a hydrogen bond but the bond between two h - o bonds within a water molecule are covalent. the greater the electronegativity difference, the more ionic the bond is. bonds that are partly ionic are called polar covalent bonds. nonpolar covalent bonds, with equal sharing of the bond electrons, arise when the electronegativities of the two atoms are equal.

carbon atoms, hydrogen, oxygen, and nitrogen.