Are commas used correctly in this sentence?

The three meals of the day are breakfast, lunch, and dinner.

Question 2 options:

no

yes

Yes.

Are commas used correctly in this sentence?

I ate chicken potatoes and bread for dinner.

Question 3 options:

yes

no

No.

Are commas used correctly in this sentence?

Billy wrote about whales, seals and dolphins.

Question 4 options:

no

yes

Yes.

Are commas used correctly in this sentence?

Sam and I, drew the picture.

Question 5 options:

yes

no

No.

Are commas used correctly in this sentence?

Grandma Smith sent cake, milk, and rolls to us.

Question 6 options:

yes

no

Yes.

Are commas used correctly in this sentence?

Juan likes to swim, ski, and dive.

Question 7 options:

yes

no