What did the countries that signed the Kyoto Protocol agree to do? O A. Stop using CFCs
B. Ban CO2 use
C. Stop depleting the ozone layer
D. Reduce greenhouse gas emissions

Help !!!

Alaska and northern canada have a diet rich in vitamin d and their skin color is darker than predicted on the basis of iv intensity at their latitude. explain the observation:

Which would happen if more forests were cut down? a. the nitrogen cycle would be stopped b. nitrogen would be fixed by bacteria more quickly c. the amount of co2 in the atmosphere would increase d. fossil fuels would build up in the soil c the amount of co2 in the atmosphere would increase

Aperson with age is more likely to catch diseases that healthy people usually don’t catch.what are these infections called?