1.
The two different species I chose that had common Homologous traits, are humans
arm and the flipper of a whale.
Some Homologous traits between the two would be the Humerus and
neck bone (seven). A giant whale has the very same amount of neck bones as
humans (seven). Another commonality is the large upper arm bone in the whale,
which would be the humerus in humans. Much of their differences in their
anatomy are due to divergent evolution.
They came from a common ancestor, placental mammals, named
for the placenta that nourishes the fetus during development.
2. The Two different species that had similar Analogous
traits are humans and an insect.
The analogous trait that they have in common is their eyes.
They both have lenses and light sensitive cells that help their eyes to collect
data that a brain can form into an image of their surroundings. The difference
would be a human just has one single large lens per eye, as for an insect
compound eye have many tiny lenses with one lens per ommatidium.
They're no common ancestors between humans and insects, due to convergent evolution, which makes it impossible for these two to have common ancestors.