1. What is the relationship between the current through each resistor and the current through the battery?
2. What is the relationship between the voltage across the battery and the voltage across each resistor?
short answers are fine, thanks.

Letter a i’d go with

Efficiency is an action of doing something. for example when you take a test. good efficiency means you did well but bad effeciency or no effiency means you did bad.

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.

It indicates no change in temperature and the process of matter changing its state