Cartilaginous fish, have skeletons made up of cartilage, such as a shark. While a boney fish, also known as teleost, have a skeleton made of bone, such as a sturgeon.
Answer:
You can buy tiny sealed marine ecosystems enclosed in glass. ... like the one in your bottle, you will need to establish an ecological balance in order for all of ... if you have too many animals consuming oxygen and not enough plants ... Water is consumed by both plants and animals, but is also excreted, purified, and reused.
Explanation:
An average person could be conscious or are able to live without eating for about thirty days. Though what's more important is that the person is having water because water is very vital and essential to the body for it is the most abundant component that could be found in a person's body. Without it, the person without eating and has no water intake could only take him or her three days.
Since the endangered species act of 1973 was passed, about 575 species of animals and 750 species of plants and lichens have been placed on the list of threatened or endangered species.