Select all the correct answers. Which two statements about composite materials are true? They’re made up of more than one substance. They have the same or similar properties as the materials used to make them. They’re always made of metal. They’re readily available in nature.

Efficiency is the percent of work put into a machine by the user (input work) that becomes work done by the machine (output work)

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

What would most likely happen if green plants were exposed to longer days of sunlight? a. the mitochondria would produce less energy . b. the chloroplasts would produce more energy. c. the cell wall would become thicker. d. the vacuoles would quickly shrink.b. the chloroplasts would produce more energy.