Aruler has markings as shown below. stefan uses this ruler to measure the length of a metal rod. how many decimal places should his answer include? 1 2 3 4

Each ruler has markings and the usual measurement is 1 foot, which is equivalent to twelve inches. The little lines between the inches is compose of 16 lines and the smallest unit of measurement is 1/ 16 of an inch. The longer the line, the larger the measurement.  Therefore, Stefan should include two decimal places in his measurements.

one negative thing it that it can kill water animals. another negative thing is it can cause the destruction of ecosystem. one way water pollution can be reduced is to conserve energy.