What is a group of cells that secrete substances into the blood or directly into an organ

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.

as resources become scarce because of population growth, the growth decreases after few years due to lack of resources and food.

answer; i believe the answer is (polygenic inheritance;