There are 10 boys and 20 girls in mrs brook's class.
mrs brook gave all the class a test.
the mean mark for all the class is 60
the mean mark for the girls is 56.
work out the mean mark for the boys.

answer: i think the answer is etheir c or d but i don't know which one but have a good day!

step-by-step explanation:

10cm

step-by-step explanation:

ik

⊂⊃⊂⊃ω

step-by-step explanation:

i hope this : )

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.