Which law, principle, or equation specifies that the mass flow rate of a fluid at two positions along a tube must be constant

Efficiency is an act of doing something

answer and explanation;

composition refers to both the types of minerals within a rock and the overall chemical makeup of the rock while texture refers to the size and arrangement of the minerals or grains that make up a rock. both composition and texture can be used to classify rocks, such as igneous rocks. texture describes how the rock became solid or crystallized from liquid, melted rock. composition of a rock describes the minerals that make up a particular rock.

That would be the corect answer hope this

Ais the answer hope this