Carbon is a non-metallic element. It is sometimes found in a pure form. Which of the following is NOT a pure form of carbon?
Carbon can form bonds with other elements to form molecules. These carbon molecules can be organic (biotic) or inorganic (abiotic). Which one of the following is NOT an organic carbon molecule?
Most organic molecules are composed of just four elements. These four elements constitute about 99% of all living things. Which one of the following is NOT one of the four principle elements found in living things?
Which of the following statements about photosynthesis is correct?
It is performed by plants and algae
It requires light energy to power this process
It converts inorganic carbon (CO2) into organic carbon
Which of the following statements about cellular respiration is incorrect?
It is performed only by animals
Which one of the following gases is the MOST abundant in Earth's atmosphere?