Sedimentary rocks are formed by cementation and compaction
Meiosis is the process of making sex cells(haploid cells). This is the main component of reproduction. Therfore, the greatest benefit is reproduction.
For the first question, I would say a line graph. And the one about the human heart, I need some more information.
Because it helps us understand our past, which in turn allows us to understand our present.
Likely he will be diagnosed by the hospital as seen as a risk constantly for violence with others. This isn't uncommon in people with drug abuse, or someone who has come from an abusive household. It's quite likely he has faced abuse and may suffer from an emotional mental health disorder. (IE manic depressive disorder, anger issues, or purely a sociopath)