How do fish obtain oxygen? a- oxygen diffuses across their skin. b- their body cells break down water molecules (h2o) and release the oxygen. c- they inhale oxygen at the surface of the water. d- they take in oxygen gas dissolved in the water through their gills.

What are the characteristics of living things

Compare and contrast cladistics and phylogeny. what are their advantages and disadvantages? which is the most useful in understanding how an organism developed into its current form? which concept most strongly supports your opinion about the origin of any given organism?

Which of the following statements about archaea and bacteria is true? a. neither is single-celled. b. they both have nuclear membranes. c. neither reproduces by binary fission. d. they both lack a nuclear membrane.