During the paleozoic era and precambrian era's, there was only one large expanse of land. where was this land located? a)near modern day australia b)near modern day iceland c)near modern day canada d)near modern day chile

The answer is Modern-day Canada

2. this rock sample is limestone and shale. with what you know about rock formation, what type of environment did these organisms live in?

radiative zone

explanation    

radiative zone is the layer of the sun which energy is transferred away from the core by radiation. although, the core is the only part of the sun that produces an appreciable amount of heat through fusion. in fact, 99% of the energy produced by the sun takes place within 24% of the sun's radius.