What does the immune system protect the body against?
changes of the internal body temperature
changing environmental conditions
changes caused by harmful pathogens
changes in the ph of the blood

Acommon kind of mechanical weathering is called

The large increase in atmospheric carbon dioxide in the last 50 years most likely comes from a. an increase in cellular respiration b. increased decomposition by bacteria c. an increase in the burning of fossil fuels d. an increase in photosynthesis

Which ocean is on the eastern coast of north and south america? arctic ocean indian ocean pacific ocean atlantic ocean