Hot-air balloons float because the air caught inside the balloon is heated up by a burner, making it less dense than the air outside. As the burner heats the air, it expands and some of the air escapes; that's what makes it less dense
1/2 - 3/7 = 7/14 - 6/14 = 1/14
Answer:
platinum-189 symbol is PT
1 and 2 are correct
Genes for the trait are present in both genders
Growing a beard in males is a sex limited trait
Explanation
The traits CAN be expressed physically
Anyone can have green eyes regardless of gender
Answer:
all elements have a different atomic number
Explanation:
Atomic number of element does not affect their reactions with others