Why are two-year-olds fond of saying no? they are testing the limits of their parents' love. they lack the ability to empathize. they are asserting that they have a will separate from their parents. they easily become overtired or over-stimulated.

Answer in a couple of paragraphs, 1 or 2 at the most if anything! 20 points + brainliest--> explain what all the systems in your body do to work together < --list of systems needed: circulatory systemrespiratory systemdigestive systemexcretory systemnervous system