Food passing from the mouth to the stomach travels through the esophagus. What is the name given to the rhythmic wave of contractions that propels food through this tube?

Which animal Phylum is the most successful?

Arteries carry blood to the heart and veins carry blood away from the heart.

During inhalation, the diaphragm contracts.

Cnidarians are herbivores that use their tentacles to trap plant matter.

The endoskeleton of an arthropod is made of chitin.

Which of the following statements is true of the phylum Nematoda?

Find the slope that passes through: 4, 512 and 8, 6{“version”:”1.1″,”math”:”4, 512 and 8, 6″}

Which region of the brain can control your respiration?

What structure is the red arrow referring to?