Answer:
1: too little body fat is a health risk
2: Sorry i got this question wrong, but its not (you can lose body fat over time with regular physical activity if your calorie in take is less than calories burned in a given day), and its not (any exercise that burns calories will cause the body general fat deposit to decrease). So just guess on it and hope for the best.
3: 1 pound
4: your basal metabolism is the amount of energy(calories) your body uses just to keep you living
5: experts agree that there is no such thing as one ideal body weight for all people
Explanation: i did the test and got 80% number 2 i got it wrong but i told you what not to pick.