Answer:
It was established on June 18 of 1981.
A is the answer because the hexabe dissolves in a matter of time.
I know this isn't answering your question but i think you will find it useful to visit the link pasted below. i just visited it and it explains pretty much everything about this.
<span>Curiosity. Curiosity is a fundamental characteristic of a good scientist. ...Creativity. ...Accuracy of Observation. ...<span>Skepticism.
but they dont need playing around not being skepticism.</span></span>
Answer:
Background extinction
Explanation:
The background extinction refers to the diminishing of the species at a fairly slow and constant rate. This extinction takes place because of the various environmental factors namely the changing climatic conditions, spreading of diseases, and destruction of habitat. It plays an important role in the natural process of evolution. This has been taking place continuously throughout the geological time and the species are undergoing continuous evolution over a specific period of time.