How does the second paragraph of the passage support the author's purpose? A.
It argues that the population of narwhals is approaching a dangerously low number.
B.
It relates a funny anecdote about the narwhal that demonstrates its gentle nature.
C.
It describes a physical attribute of the narwhal that makes it unique.
D.
It explains why the narwhal is a difficult animal for scientists to study.

It relates a funny anecdote about the narwhal that demonstrates its gentle nature.

mailman is the most possessive answee

the present continuous is a verb tense which is mainly used to indicates that an action is in progress at the moment of speaking.  

it is formed using: person + verb to be (am/is/are) +verb + - ing form  

example: i am studying at this moment .

in addition, the present continuous is also used in order to express things that will or will not happen in the near future.

example: i am having dinner with some friends tonight.

the speaker sometimes   uses it   to express that an action is repeated and it causes irritation on the part of the speaker

example: my sister is constantly complaining about everything.