Some engines require oil to be mixed with gasoline. for every gallon of gas used, 4 ounces of oil should be added. how much gas is needed if 12 ounces of oil are used?

You need 3 gallons of gas

Work Shown:

(1 gallon gas)/(4 oz of oil) = (x gallons of gas)/(12 oz of oil)

1/4 = x/12

1*12 = 4*x cross multiply

12 = 4x

4x = 12

4x/4 = 12/4 ... divide both sides by 4

x = 3 gallons of gas is needed

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.  

its totaly b

your welcome btw