The answer is H. He is mechanically digesting his food.
Answer:
The force of surface tension in the lungs is so great that without something to reduce the surface tension, the airways would collapse after exhalation, making re-inflation during inhalation much more difficult and less effective. Collapse of the lungs is called alectasis.
Explanation:
C. the making of an RNA molecule from a DNA strand by pairing of bases of RNA nucleotides with the complementary bases in DNA
NaCl is dissolved in water so that in a given region or volume the concentration is initially higher in one part than the other l, thus simple diffusion will occur so that there is a net difference or 0, with respect to the concentration of NaCl in a particular volume of water than another. Basically the NaCl will be distributed throughout volume of water.
Not exactly sure, but maybe because the powder might have something important like dna.<span />
