Answer:
In scientific reasoning, a hypothesis is an assumption made before any research has been completed for the sake of testing. A theory on the other hand is a principle set to explain phenomena already supported by data.
Explanation:
D. Gravity and Distance. The distance earth is from the sun is what's keeping us from barreling into the mass of flame and heat. The distance between us and the moon is what keeps the moon from crashing into us. It could not be C, as the definition of inertia is: "a property of matter by which it continues in its existing state of rest or uniform motion in a straight line, unless that state is changed by an external force." Hope this helps :)
Its natural selection. Due to genetic variations, some animals have traits more desirable then others. This animals will survive and reproduce better, over time creating a whole new species.
Acid chyme is buffered by bicarbonate secreted from the pancreas.
The pancreas secretes two very important things when it comes to proper digestion, and those are digestive enzymes and bicarbonate. Bicarbonate buffers acid chyme, which means that it moderates it - it neutralizes it and helps the body digest food better.