(ASAP!) Oxygen cycling in Earth's hydrosphere is often found in which of these forms? Choose the correct answer.
O nitrogen oxide, oxygen, ozone
O bicarbonate, dissolved oxygen, water
O carbohydrates, carbon dioxide, ozone
O dissolved carbon dioxide, nitrogen oxide gas

Which organelles are involved in energy conversion

Consider darwin's first writings on the theory of natural selection. an important point of darwin's essay on the principle of population, written in 1798, was a peer's observation that in nature plants and animals produce far more offspring than can survive, this observation can be attributed to a) charles lyell. b) thomas malthus. c) jean-baptiste lamarck. d) johann friedrich meckel.

Which best describes how the common cold spreads in the human body? a bacteria burst out of normal cells killing them b viruses replicate inside respiratory cells c bacteria inject dna into normal cells d viruses insert dna into bacteria