There are many threats to dolphins' continued existence. Humans are just one. Choose the correct version of the combined sentence

There are many threats to dolphins' continued existence, humans are just one.
There are many threats to dolphins' continued existence; humans are just one. 
There are many threats to dolphins' continued existence humans are just one.

There are many threats; to dolphins' continued existence, humans are just one.

Relax

Respuesta :

First one :)

Colons are used for lists, semicolons are two phrases that can be on its own but are attached, and without a comma it is just a lot of rambling. Hope that helps :)