In full detail, describe the difference between a balanced force and an unbalanced force

In balanced forces, the magnitude of the two forces is equal, whereas, in the case of unbalanced forces, the magnitude of the two forces are unequal. Conversely, in unbalanced forces, the individual forces either act in same or opposite direction. Balanced forces cause a still object to remain at rest.

Explanation:

i think a) betsy can donate only blood to mark is correct because, mark and betsy have the same blood type. whereas nobody else has b+ blood so betsy can't donate to them.

the offspring would all be white. if the parents are both white flowers then they have the genotype rr, which when crossed results in an all white punnet square.