6. Soon after the discovery of the double-helix model, researchers began examining the difference between DNA and RNA. One difference they found was that RNA

Has uracil instead of thymin as one of its nitrogenous bases

producers: apple trees, potatoes, carrots, grains, acorns, cabbage, grass, corn, lettuce

consumers: deer, mice, rabbits, chickens, squirrels, horses, worms, cows

predators: eagles, frogs, wolves, owls

answer; both surfaces of the membrane are nonpermeable