Problem: Write a question you would see in a school textbook.

Answer: When too much salt is detected in the bloodstream, the brain secretes a hormone that helps the body retain water by reducing the amount of urine produced. This is an example of

Problem: Write a question you would see in a school textbook.

Answer: Which is an example of a single-celled organism?

Problem: Write a question you would see in a school textbook.

Answer:
Which of these particles, when found in soil, contributes most to the water retention in soil?