Which is a muscular tube leading to the stomach? a.) sphincter b.) esophagus c.) large intestine d.) small intestine

Why do you think the puppy litter was all dark-haired?

Which best describes the digestive system of arthropods? a incomplete, two openings b complete, one opening c two-way, one opening d one-way, two openings

Which of the following is not a symptom of desertification? a) decrease in salt content of the soil b) lowering of the water table c) reduced surface water d) increased soil erosion e) loss of native vegetation