Why it is that we inherit mitochondrial DNA ONLY from our mothers?

In se*ual reproduction, mitochondria are normally inherited exclusively from the mother; the mitochondria in mammalian sperm are usually destroyed by the egg cell after fertilization. ... The fact that mitochondrial DNA is maternally inherited enables genealogical researchers to trace maternal lineage far back in time.

i use alot when i f my girlfriend. i'm doing her in the bathroom at summer school. shes getting her tight jeans off and then we'll begin

explanation:

answer; ///(b) it is composed of four protein chains and four heme groups;