What is a symbiotic relationship? and how does it work?

Are a special type of  interaction between species

Good morning! ~

There are 2 main different kinds of symbiotic relationships. 

One being; 
A Obligate symbiotic relationship is when 2 animals can not live without each-other. Meaning, they need each-other, or they can't survive. 

And two being;
They choose to be together, they don't -need- each-other per-say, but they want to be together. 

But in general; its a certain relationship between 2 animals. 

Ribonuclease activity is a type of nuclease that catalyzes the degradation of rna into small components.

Because the earth is not round ,but it may seem round when viewed from ,our planet but true some points earth is not round was an oblate spheroid -a square that it squashed as globe however is not even a perfect oblate spheroid.in fact isaac newton's first proposed that earth was not perfectly round but it was an oblate spheroid instead.that mean a square that is squashed as its poles and swollen at the