1. How do seismic waves help scientists determine the structures of Earth's interior? A) Seismic waves carry materials from Earth's mantle across the Earth and to the surface.

B) Seismic waves travel through meteorite remains at different
speeds.

C) Seismic waves travel through different materials at different speeds.

D)Seismic waves activate the Earth's magnetic field.

Which statement describes a way in which the digestive and excretory systems work together? a. the nephrons absorb nutrients from food going to the large intestine. b. the excretory system balances blood gases in the small intestine. c. the intestinal villi filter blood and send wastes to the bladder. d. the excretory system balances the salts and water obtained from digested food