HELP FAST ... every cell in the human body contains a nucleus with DNA, but what is the origin of that DNA!?​

Which chemical equation is unbalanced? which chemical equation is unbalanced

Explain why it’s important for scientists to study the sun. list at least two challenges researchers face when examining earth’s nearest star.

What do scientific models predict will happen to earth's temperature if current trends continue unmitigated? a. earth will heat and cool in a natural cycle b. earth will heat up and then return to an ice age c. earth will continue to warm at a rate of 0.25 c per decade d. earth will start to cool at a rate of 0.25 c per decade appex