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” Please someone help me

when atoms of different types of elements join together, they make molecules called compounds. water consists of compound molecules made up of 2 hydrogen atoms and 1 oxygen atom. this is why it's called h2o. water will always have 2 times the number of hydrogen atoms as oxygen atoms.

after receiving a stimus, the sensory receptors send(s) signals to the appropriate area of the body.  

the must be sensory neurons.  

hope its .