Why are punnets square’s used to calculate the probability of genotypes and phenotypes of one child. In other words why is it inappropriate to say “two out of four of their children will have brown hair” Someone please help me

2pos suppose an object in free fall is dropped from a building. its starting velocity is 0 m/s. ignoring the effects of air resistance, what is the speed (in m/s) of the object after falling 3 seconds? give your answer as a positive decimal without units. answer here

How many moles is 14.5 cm^3 of platinum? the density of platinum is 21.45 g/cm^3.

Astable electron arrangement for an atom is one that does not easily change. how is this arrangement arrived at? a. valence electrons are transferred or shared to create a full outer shell of electrons. b. valence electrons are discarded into space to create a full outer shell of electrons. c. protons (positive charge) pair with valence electrons (negative charge) to create a strong bond. d. outer shells with valence electrons are transferred or shared.