"i know of nothing in mary jo's conduct on that or any other occasion -- and the same is true of the other girls at that party -- that would lend any substance to such ugly speculation about their character. nor was i driving under the influence of liquor."

when kennedy uses the word substance he means
a) authority
b) evidence
c) legality
d) levity

B) evidence

Explanation:

-Authority means the power someone has to make decisions or give orders.

-Evidence refers to proofs that demonstrate that something is true.

-Legality means that something is according to the law.

-Levity means that something is not treated with the necessary importance that it should be given.

According to the definitions, the answer is that when Kennedy uses the word substance he means evidence because he is trying to say that he doesn't have any proof that demonstrates that the speculations are true.

the krebs cycle and electron transport occur in the mitochondria, though other than that i would need to know more information.