The group of macromolecules that serves as the main source of energy for livings things is

Which element forms the basis of all organic organisms a carbon b oxygen c hydrogen d nitrogen

Which of these chinese regions is the most densely populated?

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