A circle has a radius of 3 feet. A bigger circle is created so that has a ratio of radii is 4:7 with the smaller circle. What is the ratio of the circumferences? *

Step-by-step explanation:

Given that the circle has a radius of 3 feet . And a bigger circle is created so that the ratio of radii of the two circles is 4 : 7 . And we need to find the ratio of the circumferences .

Now we know that the circumference of the circle is given by ,

Now let the circumference of the first circle be and the circumference of the second circle be .

Finding the ratios :-

Hence the ratio of the circumferences is same as that of the radius .

the answer is; biodiversity resulting from few ancestors

adaptive radiation occurs when a population is subjected to a large natural environment with spatial ecological variations. the parts of the population in the different ecologies begin to adapt to their local environments. due to non-random mating across the large populations, this causes the different populations from the large population to speciate within their local environments. they, therefore, diverge to different species sharing a common ancestor.