The students are bored and uninterested by Mrs. Quinn's lecture.
Explanation:
(for future reference, you might want to add more context to the question. I recognized the question because my little brother had it on his own test a while ago, but without the context this question would be pretty hard to answer accurately.)
The calling app is the best because it lets you call people. In case your in danger, you can use this built in app and use it to call somebody for safety.
Air is a homogeneous mixture. Heterogeneous mixture means that the components are not evenly distributed, just like a mixture of sand and water where we can identify the individual components visually.
