The quantities x and y are proportional find the constant of proportionality ( r ) in the equation y = rx.

sorry can't

step-by-step explanation:

i googled though and something came up but it was in science langueage not common english sooo

can you rephrase the question ? it is unclear : -)

step-by-step explanation:

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.  

= 5

step-by-step explanation:

to find the 15th term substitute n = 15 into the nth term formula

= (- 3 × 15 ) + 50 = - 45 + 50 = 5