Answer:
"Low levels of the hormone epinephrine, also called<em><u> adrenaline</u></em>, cause blood vessels to relax and widen. High levels of this same hormone, along with the hormone norepinephrine, cause the blood vessels to narrow and the heart rate to rise, <u><em>increasing blood pressure</em></u>."
Explanation:
The mixture does not maintain a uniform composition. A homogeneous mixture really is the same anywhere you sample it, while sand generally settles out of water when given the chance and there's likely more sand at the bottom than at the top.
because they need a medium to travel they can travel everywhere if they got the medium
Answer:
Comets are frozen leftovers from the formation of the solar system composed of dust, rock, and ices. They range from a few miles to tens of miles wide, but as they orbit closer to the Sun, they heat up and spew gases and dust into a glowing head that can be larger than a planet.
