4. Crossing over is a very important event
in Prophase 1 of meiosis! What happens
during crossing over and what is the
significance?

explanation:

for  example, forests have higher evapotranspiration than other ecosystems,  such  as grasslands, because of their deeper roots and greater leaf area. thus forests have a net moistening effect on the atmosphere and become a moisture source for downwind ecosystems.

frogs. the lower the ph the higher the acid content. frogs have the highest tolerance in this scenario.

the answer is b.) hydrogen bonds between bases.