add a comma or semicolon if needed. otherwise, submit the text without any additional punctuation…

add a comma or semicolon if needed. otherwise, submit the text without any additional punctuation. hummingbirds dont have a sweet - taste receptor but are still able to recognize nectars sweetness due to a mutation in their umami taste receptors.

add a comma or semicolon if needed. otherwise, submit the text without any additional punctuation. hummingbirds dont have a sweet - taste receptor but are still able to recognize nectars sweetness due to a mutation in their umami taste receptors.

Answer

Brief Explanations:

The two clauses "Hummingbirds don't have a sweet - taste receptor" and "but are still able to recognize nectar's sweetness due to a mutation in their umami taste receptors" are independent clauses joined by the coordinating conjunction "but". A comma is needed before the coordinating conjunction when joining two independent clauses.

Answer:

Hummingbirds don't have a sweet - taste receptor, but are still able to recognize nectar's sweetness due to a mutation in their umami taste receptors.