Carlos has four notes in his wallet: $5, $10, $20 and $50. He takes out two notes at random. a There are six possible pairs of notes. List them.
b Find the probability that:
i one of the notes is $5 ii the total value of the notes is more than $50.

it would be 6xy and -16xy.

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.  

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step-by-step explanation:

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