Which events took place during the Copernican revolution, when most people started to believe in a heliocentric model of the solar system? Select three options.

Which type of respiration takes place when there is no oxygen present

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

What organ is the first to receive nutrients that have been absorbed from the digestive tract?