The correct statement about the water cycle is: Energy for the water cycle comes from the sun.
The other statements are incorrect because:
- Plants do contribute to the water cycle through processes like transpiration, and animals also participate in the cycle through processes like respiration and excretion.
- Water does not have a specific starting and ending point in the cycle; it continuously moves through various stages (evaporation, condensation, precipitation, etc.).
- Water changes form throughout the cycle (e.g., liquid, vapor, ice) as it moves through different processes.