Ineed with this. edward started his hike at an elevation of 115 feet below sea level. throughout the hike he ascended 3,200 feet then descended 676 feet. how much did this elevation change?

His elevation is changed by 2409 feet.

Step-by-step explanation:

Since we have given that

Length of elevation below sea level = -115 feet

Length he ascended = (+) 3200 feet

Length he descended = (-) 676 feet

So, this elevation changes by

Hence, his elevation is changed by 2409 feet.

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.