Us In a class of 40 students, 17 have ridden an airplane, 28 have ridden a boat. 10 have
ridden a train, 12 have ridden both an airplane and a boat. 3 have ridden a train only
and 4 have ridden an airplane only. Some students in the class have not ridden any of
the three modes of transportation and an equal number have taken all three.
a.
How many students have used all three modes of transportation?
Solution:
b. How many students have taken only the boat?
Solution:
c.
How many students have not taken all three modes of transportation?
Solution:

took the test it's 94

sorry i need the points

step-by-step explanation:

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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: