Three-year-old sara sees a little boy fall and hurt himself. she gets a look of concern on her face. she is probably experiencing
a. frustration
b. empathy
c. fear
d. sadness

Before tuberculosis was understood to be a communicable disease, and before the discovery of antibiotics to treat it, a major outbreak could kill or cripple a significant portion of a nation’s labor force. how would such an event affect the economy? illustrate the effect by dragging to shift either the aggregate demand curve or the long-run aggregate supply curve.

What period of history refers to the time when people did not have written records

Carbon tetrachloride is a toxic liquid. a carbon tetrachloride molecule has one atom of carbon and four atoms of chlorine. what is its chemical formula?