Before a chemical reaction can start, must be absorbed by the reactants. the amount that must be absorbed to start the reaction is called the

How many years would it take the atlantic ocean to grow 500 centimeters? show your work.

Dna. we have heard that we are a product of our dna. but where is it? how do we "get" our dna? it is passed to us, from our parents, but in what form? several vocabulary words associated with inheritance are used interchangeably and sometimes, incorrectly. let's see if you can clear this up for someone just learning about inheritance and cell structure.

The big bang theory suggest that the universe is about - 300 million years old - 4.6 billion years old - 30 billion years old - 13 billion years old