Why does a hot air balloon float?
1. the shape of the balloon provides lift.
2. the volume of the air displace by the balloon is less than the volume of the balloon.
3. the weight of the air displaced is less than the volume of the balloon.
4. the weight of the balloon is less than the weight of the air displaced by the balloon.

the correct answer is: d. the saltine and pretzel are made of flour, yeast, and baking soda, and salt. the pecan contains no flour but it does contain fats. the pecan is a nut that can be consumed as a healthy snack. first of all, pecans are a source of fat (monounsaturated fat), but they provide less fat than some other nuts. pecans are a rich source of dietary fiber, manganese magnesium, phosphorus, thiamin, vitamin e…

the correct answer is option b

behavioral response need communication and thus co-ordination at several levels such as interaction among cells, organ system and the entire organism.

behavioral response produces both internal and environmental stimulus.