Question

Seals can dive very deep - Do I use a period or an exclamation mark?

Answer 1

Yes, you should put an exclamation mark, because you got to show emphasis on that short fact!

Step-by-step explanation:

(☞ﾟヮﾟ)☞Have great day

Answer 2

Both punctuation marks actually fit the sentence(meaning both can be used).But if you were to write it in a more serious manner like stating or discussing a fact, i think that you should use a period.