Science Homework Help

As
a result of human activity (such as logging), large forests are becoming fragmented
into several smaller forests.

a)      How
might the increasing isolation of population in these forests influence their
evolution?

b)      How
might the fragmentation affect the evolution of a large mammal, like a moose,
compared to a small invertebrate, like a worm?

Please explain it clearly so I can understand it properly.