The Miller-Urey experiment demostrated that

Your

energy from lightning might have helped create Earth's firs organic molecules

liposome membranes containing organic molecules preceded true cells

organic molecules first could have come to Earth on a meteorite

iron-sulfide bubbles may have acted as the first cell membranes

Ascientist is designing an investigation to study the impact of invasive bird populations on local, native bird populations at backyard bird feeders. what population is most likely to be a control group for the investigation? amount of food number of bird feeders invasive bird populations local backyard birdfeeders without food

Abird flies by moving its wings up and down. which two systems are most directly responsible for the movement of a bird's wings? a. skeletal and muscular systems b. respiratory and muscular systems c. skeletal and digestive systems d. respiratory and digestive systems

Explain why it’s important for scientists to study the sun. list at least two challenges researchers face when examining earth’s nearest star.