Un frutteto di forma rettangolare, riprodotto su una mappa in scala 1:8000, ha le dimensioni di 25 cm e 18 cm. Se in ogni ettaro (1 ettaro=10 000 m^ 2 ) vengono piantati 420 alberi, quante piante occorrono? Risposta [120 960]

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.