A(n) is a collection of all of the abiotic factors and biotic factors in an entire region.

a) habitat
b) ecosystem
c) community
d) ecological niche

liquid crystals are matters in a state which have properties between those of conventional liquids and those of solid crystals[1]. liquid crystal is partially ordered and anisotropic. in terms of molecular order, liquid crystal molecules have one-dimensional or two-dimensional long - range order.

i think its the first one