Answer:
an
Explanation:
The word idea starts with a vowel and the adjective needed shouldn't also end with a vowel. And in this case, you can't use a because it's a vowel. So, you use an.
Answer:
It compares
Explanation:
When the word "while" is used here in this instance;
Did you know that crocodiles tend to have longer, pointed, V-shaped snouts <u><em>while </em></u> alligators generally have wider, rounder, U-shaped snouts?
The "while" is comparing the snouts of crocodiles and alligators, saying crocodiles have V-shaped [pointy] snouts and alligators have U-shaped [round] snouts.
I hope this helps! :)
