Problem:OPTIONS:
- flooding
- air quality
- animal crossings
- earthquakes
- toxins
- trees bending
- influenza
- Pesticides

You are presented with the quiz "What causes damage to man-made structures?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "an earthquake causes the ground to shake" and "examples include damage to man-made structures, ground failure and felt shaking". So, what's the best answer to the question?
****
A: earthquakes

Problem:OPTIONS:
- Birds
- humans
- clams
- sharks
- life
- ecosystem
- amoeba
- edible

You are presented with the quiz "what lives in most terrestrial, freshwater, and marine habitats" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "mollusks live in most terrestrial, freshwater, and marine habitats" and "clams are mollusks that live in the sea or in freshwater". So, what's the best answer to the question?
****
A: clams

Problem:OPTIONS:
- photosynthesis
- Plant reproduction
- diploid sperm and egg
- mate with females
- Leptospirosis
- haploid sperm and egg
- triploid sperm and egg
- two haploid eggs

You are presented with the quiz "What is a diploid zygote the result of?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "gametes then unite in fertilization and form a diploid zygote" and "gametes are haploid egg or sperm that fuse to form a zygote". So, what's the best answer to the question?
****
A: haploid sperm and egg

Problem:OPTIONS:
- flower
- pollen
- pH
- H20
- cells
- leaf
- slow
- root

You are presented with the quiz "plant's growth of what is benefited from sandy soil" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "the looseness of soil has a positive impact on a plant 's roots' growth in that soil" and "sandy soil feels gritty and loose". So, what's the best answer to the question?
****
A:
root