What is the cell structure made of a phospholipid layer? a. Golgi apparatus
b. endoplasmic reticulum c. cell membrane
c. a nucleus and ribosomes
d. ribosome

Asun-sized star will spend most of its lifetime as a: white dwarf red giant protostar main-sequence star

Why don't you see your reflection in water with waves or repples

Students design a model roller-coaster track. they place a rubber ball at the highest point on the track and let it go. the ball rolls along the track pulled only by the force of gravity. eventually, it comes to a stop. which change to the design will result in the ball moving the greatest distance?