Achemical reaction is when two elements or radicals change places with two other elements or radicals is a reaction
a- double replacement
b- combination
c- decomposition
d- substitution

Which branches of natural science include the study of an organism that lived 10 million years ago

Give an example of a collision in real life. use the law of conservation of energy to describe the transfer of momentum. be sure and discuss the momentum before and after the collision occurs. you will need at least 3 sentences to thoroughly answer this question.

What is the increase in density of a medium due to wave travel?