Imagine a little box of spoons. Now, imagine on moving day that that box of spoons is put into a bigger box with all of the silverware. Now, imagine that that box of silverware is placed into an even bigger box with all of the kitchen stuff.
Now, imagine that the box of kitchen stuff is placed in the moving truck with all of the stuff from your house. In the end the within the truck is all of the stuff from your house, within kitchen box are all of the things from the kitchen, and within the spoon box are just the spoons.
In the same way, we will group organisms according to their physical appearance into hierarchical categories.
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Corals are animals, even though people think they look like plants or rocks. You can read more about it here.
Is coral a living animal or is it just a plant?
And why is coral and a jellyfish in the same category?
Some animals have a layer of tissue in their eyes that reflects light which is called the tapetum lucidum. This layer of tissue allows for more light to be present in the animals’ eyes so they can see better in the dark. Most of these animals are nocturnal (they are more active at night). A downside to having a that the image the animal sees in bright light is blurry but the benefit is being able to see well in low light conditions. So when we can see the glow of an animal’s eyes we are just seeing reflected light off the tapetum lucidum. Hope this helps, here’s a link to more information:
http://en.wikipedia.org/wiki/Tapetum_lucidum
Why do some animals’ eyes seem to glow?