<span>Reptiles and birds excrete waste as an insoluble white solid that is called uric acid. This means that these wastes are made of very little amount of water. This helps them to maintain internal homeostasis in hot climates since the presence of water allows them to cool easily.</span>
Humans caused damaged by all the pollution in the earth atmosphere with is making global warming it changes by how much pullution is going into the atmosphere
The three examples of stimulus include;
1. Hit the skin with a needle or pin is a good example of stimulus. The sudden removing of the hand is the response.
2. When somebody bangs a door you jump if you were unaware because of the sound. The jumping is the response to a stimulus.
3. Holding a hot plate we fling hand away from it. The stimulus here is holding the plate while removal of the hand is the response.
Stimulus is the change or cause in an organism's surrounding which causes the organisms to react.
The correct answer is B. Oxygen.
Oxygen, as a part of the atmosphere, also participates in UV protection, besides being necessary for breathing.
