Answer:

when there is a radical in the denominator, we should rationalize (mutiply the denominator and numerator by the radical) to get rid of the radical in the denominator.
Answer:
A.
Explanation:
The continents on Earth have a fixed position.
Sorry if I'm wrong but I hope this helped
Chemical properties is when a material undergoes a chemical change or reaction like a nail rusting and a physical change can be observed without changing the material like temperature, color, texture, odor,etc.
I think C. Mutualism.
Hope this helps :)