More About Symbiosis

Symbiosis is a relationship between two organisms where one organism lives on, near, or inside the other, and where one of them benefits. There are three types of symbiotec relationships- mutualism (both organisms benefit), commensalism (one benefits and the other is not harmed), and parasitism (one benefits and the other is harmed). An example of mutualism is a clownfish and a sea anemone. An example of commensalism is lichen on a tree. An example of parasitism is fleas on a dog. Some new facts I learned from http://en.wikipedia.org/wiki/Symbiosis, were that the term "symbiosis" was first used by German mycologist Heinrich Anton de Bary in 1879. He defined it as "the living together of unlike organisms." I also learned that the evolution of all eukaryotes (plants, animals, fungi, and protists) is believed to have resulted from a symbiosis between various sorts of bacteria.

I think that symbiotec relationships are very important in the field of ecology. It's also interesting to learn what type of relationship various animals have with each other.

Which Came First- The Egg or the Chicken?

People have been debating over which came first for hundreds of years now, but the truth is that scientists have the answer. Scientists believe the egg came before the chicken because of a discovered nest of a small carnivorous dinosaur. The nest has some bird-like characteristics, so if you take the saying literally, obviously the egg came before the chicken. Dinosaurs were making bird-like nests and laying bird-like eggs way before chickens evolved. So now the question is: Which came first- the dinosaur or the egg?

Before I read this article, I thought the chicken came before the egg. But now I realize that bird-like eggs came before birds and chickens. I hope scientists are able to keep researching so that we figure out if the dinosaur or the egg came first. For more info, go to http://news.yahoo.com/s/livescience/20081114/sc_livescience/whichcamefirsteggsbeforechickensscientistsnowsay;_ylt=AvGp6zJWT4M7zk6OzFdNXpkPLBIF