1-a- add the significance or important of coefficient of retaldness and why to calculate r ?
2-a- mention their hypothesized evolutionary relationship the apple maggots.
2-b- should be primary literture source and apa style
3-a- explain more about homo neanderthalensis and homo sapiens interbred and explain why it does ?
3-c- make sure its primary literature and apa style
4-b- apa style citation 4-c- explain more on why it has evolved from this phenomena and add more to the potential cost