IM SO CONFUSED WHATS 1+1

Remote sensing of the earth's surface and atmosphere may involve the use of what type of instruments?

Which best describes standard precautions?

Jim has found that he must consume 2,300 calories a day to reach his health goals, but he doesn't want to give up his afternoon snack of pretzels. unfortunately, he tends to eat the entire bag — which amounts to 1,300 calories! what strategy should jim use to improve his habits?