Answer:
A scientific hypothesis must be testable, and;
A scientific hypothesis must be falsifiable.
Explanation:
I looked it up o-o sorry if its wrong. :3
The water from natural resources contain minerals that change the ph of water.
Answer: Option A) Parathyroid glands
Explanation:
The Parathyroid gland located in the neck region helps in the secretion of an hormone called Parathormone.
This hormone helps to raise the levels of calcium ions in the body, by preventing the loss of calcium ions through urine, and also preventing excess deposit of calcium ions in the bone, thus regulating bone density.
A X-rays I think this is the answer
Im pretty sure they repel from the charged protons
