Which of the following explanations accounts for the formation of sunspots?

Blood has traveled from the heart to the toes. which describes the next step of the circulation process?

Which member of the following food chain will be least affected by ddt, a pesticide water pollutant, if bio-magnification is occurring? algae> zooplankton> crayfish> leopard frog> large mouth bass

Math focus 4. calculate a map has index contours at 250 m, 500 m, and 750 m. what is the contour interval?