Is doubling of time factor is the number of year it takes for a population to double in size

Doubling of time factor is the number of year it takes for a population to double in size is a true statement.

Explanation:

As per the definition of doubling time, it clearly states that double time is the total amount of time which is required for a given amount of time of quantity to get doubled in size or at any value at a constant growth rate.

So if we are looking to measure the doubling time or how much time will it take to double the current population than the answer is 63 years.

2. this rock sample is limestone and shale. with what you know about rock formation, what type of environment did these organisms live in?