Question:
Use evidence from the fact that when light enters the eye through the pupil , that light falls on the retina to answer the following question. "A retina may be illuminated by"

Answer:
campfires

Question:
Use evidence from the fact that if a population decreases to zero then that organism is extinct to answer the following question. "Which of the following has a population of zero?"

Answer:
Merriam's elk

Question:
Use evidence from the fact that a living thing is made of cells to answer the following question. "Red blood cells help your"

Answer:
breathing boxes