Which of the following will most likely occur from the modification of natural ecosytems by humans?

What are some possible short and long term medical concerns for crew members on longer space exploration trips

How does human environment effect the biosphere

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