System Haptics on the iPhone 7. Apple introduced the Taptic Engine with the iPhone 6s, where it replaced the old vibration motor and was also used to provide haptic feedback for when you activated 3D Touch. This year with the iPhone 7, Apple has improved the Taptic Engine and it plays a critical role in simulating the press of the Home button, which is no longer a physical button.
The Dietary Guidelines for Americans 2010 recommends that sedentary teenage girls consume 1,800 calories per day. Active teenage girls get daily physical activity that is equivalent to walking more than 3 miles per day at 3 to 4 miles per hour. These teens need 2,400 calories per day.
How many calories does a person need per day? WebMD states that females ages 19 through 30 who are sedentary should consume between 1,800 and 2,000 calories per day. If they are moderately active they should eat up to 2,200 calories. If they are highly active then they should eat 2,400 calories.