The respiratory system regulates oxygen flow, and provides regulation for oxygen blood content. Circulatory system plays a roll in providing enough oxygenated blood to the body
The time taken to double the population is 58 years.
<h3>What is exponential growth?</h3>
An exponential growth problem is one for which we define the model; P= Poe^rt
Where;
P = population at time t
Po = initial population
r = population growth rate
t = time taken
1800000 = 900,000e^(0.012 × t)
1800000/900,000 = e^(0.012 × t)
2 = e^(0.012 × t)
ln2 = 0.012 × t
t = ln2/0.012
t = 58 years
Learn more about population growth: brainly.com/question/12228859
A representative sample is a reflection of the characteristics of the certain group ( population) as a whole. Sample size is the number of representative samples (individual pieces of data) used to calculate a set of statistics. The greater this number the better the determination of the average values of their data. Having greater number of samples also avoids errors from testing a small number of possibly atypical samples.
the answer should be A replication
