Farmer doug has some pigs and chickens. one day he counted 24 legs and 7 heads in the barnyard. how many of each animal did farmer doug count?

Farmer Doug counts 2 chickens and 5 pigs.

Step-by-step explanation:

Let x be the number of chickens and y be the number of pigs.

Since a chicken has 2 legs and a pig has 4 legs

According to the question , we have two equations :-

Divide 2 on both sides in equation (2), we get

Now, Subtract equation (1) from (3), we get

Put y=5 in (1) , we get

Hence, Farmer Doug counts 2 chickens and 5 pigs.

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.  

i hope this is what you were looking for.

see attached graph