Which of the following do all of the small objects in the four categories (dwarf planets, comets, asteroids , and meteoroids) have in common?
a) they all orbit the sun
b) they all have icy compositions
c) they are all less than a kilometer in diameter
d) they are all located in an asteroid belt
it should be d I think
it's c (engineer's do their work with mechanical stuff not on any living being)