Given a scientific passage and an answer, generate a question for the given answer.

[Q]: Passage: solid waste that remains after food is digested and is eliminated from the body through the anus. Answer: solid
[A]: What type of waste is eliminated from the body through the anus?

[Q]: Passage: Carbon moves through ecosystems in two cycles that overlap. In the biotic cycle, it moves between living things and the air. In the abiotic cycle, it moves between the air, ground, and oceans. By burning fossil fuels, humans have increased the amount of carbon dioxide in the air. Answer: biotic cycle
[A]: In what part of the carbon cycle does carbon move between living things and the air?

[Q]: Passage: Examples of machines that increase the distance over which force is applied are paddles and hammers. Figure below explains how these machines work. In each case, the machine increases the distance over which the force is applied, but it reduces the strength of the applied force. Answer: strength
[A]:
Paddles and hammers are examples of simple machines that increase the distance over which force is applied, while reducing what?