I can answer number 3. Osmosis is a unique property of water that allows water to move past cell walls. Like when water evaporates out of your plastic cup.
When you breathe in, or inhale, your diaphragm contracts and moves downward. This increases the space in your chest cavity, and your lungs expand into it. The muscles between your ribs also help enlarge the chest cavity. They contract to pull your rib cage both upward and outward when you inhale
The correct answer for this question would be repressible enzymes. Repressible enzymes are those which bind to the operator, and then block the attachment of RNA polymerase, which therefore prevents the transciption of genes. From this, we know that these are the types of enzymes that are synthesized in an environment where an operon is needed to code for enzymes that synthesize a protein from precursor amino acid molecules.
