boundary / a bounded area or region / a bounded group of people, a society, a world as a social grouping, such as business, celebrities, or finance / the border edge of a thing

border, boundary, limits

natural / spontaneous

naturally / spontaneously / rarely / coincidentally

an organism; a life form

interaction

researcher

a laboratory

research association; research society / group of enthusiasts (as may be found in schools, colleges, etc)

(education) research project, done by Japanese schoolchildren during summer break, to be presented upon return to school