Atheory is an explanation of observable facts and phenomena.

Ascientist and her team counted 200 individual deer in an area of 10 square kilometers. what is the population density?

Are these strong bases, neutral, strong acids, weak acids or weak base household bleach (ph=12.6) fluid in a car's battery (ph of less than 1.0) milk (ph=6.7) stomach contents (ph=2.2) pure water (ph=7)

What was the land like over 500 million years ago? what was under the sea?