Aresearcher is monitoring a colony of single-celled organisms and notes that the colony is releasing carbon dioxide (co2) and using up oxygen (o2) in the closed clear glass container in which it is being kept. which of the following can be assumed about these organisms from these observations?

Which greenhouse gas is emitted when burn fossil fuels for energy? a. nitrogen b. oxygen c. carbon dioxide d. helium

Which of the following statements is true about the relationship between genetic variation and natural selection? a. genetic variation must be present in a population before natural selection can act on it. b. genetic variation arises in a population as a result of natural selection. c. natural selection can act on a population whether there is genetic variation within the population or not. d. after natural selection acts on a population, the amount of genetic variation in the population always increases.

When you exhale, air in you lungs moves from the does anyone know the correct answer on apex