Question

Select the correct word in the passage.
Some unicellular organisms can take in food particles directly from the outside environment through phagocytosis. This process is shown in the diagram below.



The diagram shows that during phagocytosis a unicellular organism's pseudopod engulfs food particles and brings them directly into the organism. Which structure described in the passage below performs the same function for a bluebird that a pseudopod performs for a unicellular organism?

A bluebird uses its beak to capture an insect flying in the air. The insect travels to the bird's stomach, where an acid is released to begin breaking the insect down into smaller particles. It then travels to the bird's gizzard, which further grinds and digests the particles of the insect. Once the particles leave the gizzard, they travel to the bird's intestines, where nutrients from the particles are absorbed. Particles that cannot be absorbed continue through to the bird's cloaca, where they are expelled from the body.

Answer 1

Beak.

Explanation: the pseudopod engulfs and brings food into the organism; likewise the bluebird's beak captures the insect and brings it into the bird's body for digestion.