Answer:
Because if the 4-year-old child passes out from holding his breath, he will immediately begin breathing again, keeping him alive.
It's letter c i believe, because they need the DNA's instruction on how to copy the exact tissue copy.
Answer:Movement makes dolphins stress which can make your insusceptible framework more vulnerable and the flare-up will spread to different dolphins and conceivably other species.
When the surface water is heated by the sun it dissolves more salt i believe
