Thank you Logan for doing and submitting your homework. ^^

Note: Please always use a capital letter at the beginning of a sentence.

1.chimpanzees are very strong.
Correct: Chimpanzees are very strong.

2.I saw crows at the park.
CORRECT!
 
3.my frenids dad is police officer
Correct: My friend's dad is a police officer.
>> Be mindful of the correct spelling. We use ( ' ) s - apostrophe s to describe that the father of your friend is a police officer.

4.pepole have to protect animals.
Correct:People have to protect the animals.
>>Be careful of the spelling. We need to use the article "the" when talking about the group of people, animal etc.

5.fire fighter is brave.
Correct: The Firefighter is brave.
>> We use article " the" to talk about specific thing, person. Firefighter is not a compound noun its a one word.