One evening, four friends were chatting in a park.

Anil: There are so many Mango trees here.
Bhavya: I am sure there will be many birds in the park.
Charita: We should not throw trash in the park.
Danny: My doctor told me that mosquito bites can cause Malaria.

Who has made a statement that a scientist would call an OBSERVATION?
with explaination please 

Dear Student 

Anil has made an observation because he saw trees in the park and made a statement.
Bhavya has made an assumption, she did not see those birds in the park.
Charita and Danny said something which others told them and they have learned.

Regards

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