When you compress the heart in this demonstration, why does the water squirt out of the artery? A. It's just like squeezing a sponge
B. The arterial valve sucks the water out of the ventricle
C. The atrio-ventricular valve has parachute-like flaps to stop the water coming out the top
D. The atrioventricular valve works like a rigid door to stop the water coming out the top

Consider the following planned experiment. factor experimental group control group light exposure tots of sun tots of sun amount of water weekly weekly type of soil nutrient rich nutrient rich size of pot large which variable is being tested in this experiment? small a. size of pot b. type of soil c. light exposure d. amount of water

When rutherford performed his metal foil experiment, he was surprised that most of the alpha particles

Which of the following observation darwin shape his concept of descent with modification? a) species diversity declines farther from the equator. b) fewer species live on islands than on the nearest continents. c) birds live on islands located farther from the mainland than the bird's maximum nonstop flight distance. d) south american temperate plants are more similar to the tropical plants of south america than to the temperate plants of europe. e) earthquakes reshape life by causing mass extinctions.