A predicate is the part of a sentence that contains a verb wich tells something about the subject.
Now, in simple present or present progressive the formula is: subject + verb+ complement; the verb is the predicate. Taking the first three example, the subject is circled and the verb verbs comes after.
Answers are underlined:
The West Indian Manatee <u>is large a sea mammal.</u>
Manatte <u>rest just below the water's surface.</u>
Sea grass <u>is one of their favorite things</u> to eat.
In the last one it can't be eat the predicate because the predicate refers always to the subject, and 'sea grass doesn't eat'. "To eat is a complement"
The answer is B.
Hope this helped.
"between the two countries"
A prepositional phrase needs to contain a preposition, in this case it would be "between". As well it needs to modify the sentence and it should mention the object of the sentence. So "between the two countries" is correct.
