Two fifths of the vehicles were trucks. A: How many vehicles were trucks B: What percent of the vehicles were trucks

For B, 40% of the cars were trucks.

Step-by-step explanation:

If 2/5 of the cars are trucks, and you can convert 2/5 to 20 out of 50, and then 40 out of 100, making it 40%

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.