Problem:OPTIONS:
- bushes
- A seed
- The ocean
- An egg
- spring
- Tropical
- Sand
- pollen

You are presented with the quiz "Where do flowers come from?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "the force of water against the seed coat causes a root to emerge from a seed" and "when the seeds are watered, they grow into a huge root, and then the root sprouts flowers". So, what's the best answer to the question?
****
A: A seed

Problem:OPTIONS:
- dogs
- bamboo
- humans
- potatoes
- sunlight
- Conifers
- ovaries
- flowers

You are presented with the quiz "What contains chloroplasts, organelles found in the cells?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "chloroplasts are organelles that are found in the cells of plants and algae" and "bamboos are vigorous, rugged plants". So, what's the best answer to the question?
****
A: bamboo

Problem:OPTIONS:
- relocation
- the loss of topsoil
- Plant growth is reduced
- to move people
- Physical weathering
- forest is destroyed
- Water expanding
- water conservation

You are presented with the quiz "Deepening rivers cause" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "erosion causes a river to become deeper and wider" and "fertile topsoil is then lost in erosion". So, what's the best answer to the question?
****
A: the loss of topsoil

Problem:OPTIONS:
- unknown
- safe
- threatened
- harmful substances
- Pollution
- foreign
- barrel-shaped
- contaminated

You are presented with the quiz "Scraping oneself on an object that is what, may cause an invasion of the body by bacteria?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "scraping oneself on a contaminated object may cause infection" and "an infection is an invasion of the body by bacteria". So, what's the best answer to the question?
****
A:
contaminated