Question

It can be inferred that fleas will emerge from eggs as adults _________________.

• A. when they outgrow the cocoon
• B. after the period of 3 weeks
• C. when they sense there is access to blood
• D. if there is too much carbon dioxide in the cocoon

Answer 1

The correct option is C when they sense there is access to blood

In para 6, we learn that fleas "will hatch when conditions become favorable. Fleas can detect warmth, movement, and carbon dioxide in exhaled breath, and these three factors stimulate them to emerge as adults." We can infer those three factors are crucial because they indicate the presence of living things that contain blood, which the new adults need in order to live. This means that fleas only emerge from eggs as adults when they sense there is access to blood.