Sentence Correction (SC) | Re: Found only in the Western Hemisphere and surviving through extremes of

But in option B, (B) Found only in the Western Hemisphere,hummingbirds survive through extremes of climate, their range extending from Alaska to Tierra del Fuego, from sea-level rain forests to the edges of Andean snowfields and ice fields at altitudes of 15,000 feet.

1. If we remove the part between the 2 commas, it would make no sense.
2. When can we remove the part between the 2 commas to check whether the sentence is making sense or not.