Answer:
sorry. I can't not answer this question now cause i already submitted it. i did not mean to.
It would be the second option about 540 million years ago.
Rapid cooling produces small crystals, and slower cooling produces large crystals.
Hope this helped!
Adaptive radiation is the process of development of new forms of organisms from an ancestral species. <u>When an environment changes or some new niches open, speciation from the ancestral species occurs.</u> New species have morphological and physiological adaptations which allow them to exploit a whole range of divergent environment.