Some effort has been made to extract DNA from fossilized dinosaur bones that have been buried for many millions of years in arid climates. In what form is this DNA most likely to be found

Ialready know the answers to these questions and they are on the attachment. but i just need to know why that answer is the correct one. plz asap! this is for a report that i need to email by 10!

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?

What are the two causes of density in deep current waters? a. salinity (how much salt) of the water and high temperaturesb. salinity (how much salt) of the water and low temperatures c. oxygen content of the water and high temperatures. d. oxygen content of the water and low temperatures