Answer:
Mitochondrial DNA is useful as a molecular clock because it displays uniparental inheritance
Which statements describe why organisms are classified? Check all that apply.
1. Classification shows how closely related organisms are to each other.
2. Classification makes organisms easier to study.
3. Classification allows for better identification of new organisms.
The grouping system makes it easier for scientists to study certain groups of organisms.
When referring to knowing where to find something when you need it you mean that you do not need a memorization of all things, you just need a source to find it when in need. I hope this answer suited your needs.