changes in biodiversity overtime

Question 1

divergent evolution

Answer 1

species that are more similar become less similar
they share a common ancestor but because of different selection pressures change from each other
for example primates and homosapeans may have homologous structures

Question 2

convergent evolution

Answer 2

species that are less similar become more similar
this does not mean they are becoming the same species
they have similar features because of similar selection pressures
for example analogous features (dolphins and sharks have similar fins)

Question 3

features of divergent evolution

Answer 3

common ancestor
diverge to produce homologous structure
species appearance becomes more different over time
species are closely relates (genetically similar)

Question 4

features of convergent evolution

Answer 4

different ancestor
converge to produce analogous structures
species appearance becomes more similar over time
species are unrelates (genetically different)

Question 5

extinction

Answer 5

when there are no members of a species remaining

Question 6

mass extinction

Answer 6

when lots of species become extinct very quickly