Which of the following is not a geometric sequence?

2.8,6.72,16.128,38.7072
-7,-5.8,-4.6,-3.4,-2.2
1,-3,9,-27,81

i got 86 for this

hope this !

if you need an explanation just ask

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.  

ummm seems that u didnt post the attachement !