As isosceles triangular truss has congruent sides of length of 20 feet and the altitude to the base measures 10 feet. What is the measure of the base angel ?
A-20 degrees
B-30 degrees
C-50 degrees
D- 60 degrees

the answer to the expression is 83

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.