Answer:
Calcium can build up in your pool water when the pH levels are off and leave deposits on your pool tiles. It's similar to what happens in your bathroom sink, toilet or bathtub.
More details:
There are two types of calcium compoundsthat form in pool water and create scaling--calcium carbonate and calcium silicate. Both are caused by a pH imbalance. Your pool should be at a pH between 7.4 and 7.6.
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B, of course! DNA is often referred to the ‘genetic code’ of the body and do regulate the production of genes.
Answer:
The purpose of vaccination is to produce immunity.
Explanation:
Immunity means the presence in a person's body of cells and substances known as antibodies that can produce a protective immune response.
Explanation:
Survival of the fittest is a phrase that originated from Darwinian evolutionary theory as a way of describing the mechanism of natural selection.In On the Origin of Species, he introduced the phrase in the fifth edition published in 1869, intending it to mean "better designed for an immediate, local environment".
An astronomical unit (AU) is the approximate distance from the earth to the sun. The answer is D.
