Which human activity contributes the MOST Carbon dioxide to the atmosphere? A. Fishing
B. Breathing
C. Burning Fossil Fuels
D. i Farming

Which best describes how the common cold spreads in the human body? a bacteria burst out of normal cells killing them b viruses replicate inside respiratory cells c bacteria inject dna into normal cells d viruses insert dna into bacteria

How did the discovery of the rhesus factor affect society? o more patients died from having a transfusion with the wrong rhesus factor 0 new treatments during pregnancy could prevent harm to the developing child. o less donated blood could be used in the treatment of patients. the number of blood types was reduced by half

How does secondary succession differ from primary succession?