Given a scientific question, generate a correct answer to it.

[EX Q]: What do you call a mirror shaped like the inside of a bowl?
[EX A]: concave

[EX Q]: What kind of energy is specifically defined as the energy that is available to do work?
[EX A]: free

[EX Q]: What increases the chances of someone inheriting a mitochondrial disease?
[EX A]:
presence of defect mtdna and undefected mtdna