The spheres that only earth has are a

Depending on the organism the number of in a cell may change

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 worm has eyespots that are used to detect light? a fluke b marine worm c planarian d tapeworm