What is the equivalent ratio of 1:2 = __:4

2:4

Step-by-step explanation:

Notice how the 2 has now become a 4

that implies that the ratio has been doubled, to make the ratio remain the same we have to double the 1, double of 1 is 2 so the new ratio is 2:4

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.