Which is the sun most likely to become toward the end of its lifetime?
select one:
a. a protostar
b. a black hole
c. a neutron star
d. a white dwarf star

Which technology do environmental scientists use to track the movements or polar bears and other vulnerable populations? a) geographic information system(gis) b)environmental dna(edna) surveillance c) global positioning system(gps) d) unmanned aerial system (uas)