Question

1. animals become __________ when there are no more of that species left alive on earth.

• ghosts
• fish food
• extinct
• adaptive

Explanation:

To solve this, we analyze each option: "ghosts" is not related to species survival. "fish food" refers to being food for fish, not species extinction. "adaptive" means having adaptations, not no species left. "extinct" is defined as a species having no living members, matching the description.

Answer:

C. extinct