Question: You are presented with the quiz "What does a black item do?"   But you don't know the answer, so you turn to your teacher to ask for hints. He says that "if an object is black then that object absorbs all visible light" and "an object is an item in the real world".   So, what's the best answer to the question?
Answer: absorbs all visible light

Question: You are presented with the quiz "What do Echinoderms lack?"   But you don't know the answer, so you turn to your teacher to ask for hints. He says that "echinoderms lack respiratory and excretory systems" and "lung mechanics and gas exchange are topics during study of the respiratory system".   So, what's the best answer to the question?
Answer: Lungs

Question: You are presented with the quiz "What is a positive effect of plant needs for water and minerals from soil?"   But you don't know the answer, so you turn to your teacher to ask for hints. He says that "most plants grow roots down into the soil to absorb water and minerals" and "plant roots begin to stabilize the soil against erosion".   So, what's the best answer to the question?
Answer:
erosion prevention