An object moves +4 m/s for one minute. then it turns around and moves -4 m/s. what had to change during the time the object reversed its direction? a only its speed b only its velocity c both its speed and its velocity d neither its speed nor its velocity

i think it is 70

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.