I need Help!!!!!!!!!!!!!!?

Here are the only ones that should be corrected:

Sam's

building's

students'

eagle's

birds'

The other sentences are correct. (I'm an English teacher)

Sam's sketches are displayed near the school office.

It is good way to compare several birds’ habitats.

You can observe their nests on a cliff or under a building's eaves

Some students' reports are about the diets of various birds.

I read that a bald eagle's favorite food is salmon

Victor taped the sound made by a hummingbird’s wings.

Some bird's migration journeys can cover thousands of miles.

The map’s key can help you figure the distance in miles.

On Parents’ Night, we will present our bird projects.

I am only putting corrections, those omitted were already correct.

Sam's sketches are displayed near the school office.

You can observe their nests on a cliff or under a building's eaves

Some students' reports are about the diets of various birds

Some birds’ migration journeys can cover thousands of miles.

Here's the rule----

singular things -- a duck --add 's ie a duck's wings

plural things the boys , add ' only ie the boys' locker room

Now do your own homework. It's easy.