Primary, secondary and tertiary sectors. There are three main types of industry in which firms operate. These sectors form a chain of production which provides customers with finished goods or services. Primary production: this involves acquiring raw materials.For example, metals and coal have to be mined, oil drilled from the ground, rubber tapped from trees, foodstuffs farmed and fish trawled.ertiary production: this refers to the commercial services that support the production and distribution process, eg insurance, transport, advertising, warehousing and other services such as teaching and health care. Your web browser does not have JavaScript switched on at the moment.
A millimeter is smaller than a centimeter. A millimeter is  one-thousandth of a meter and a centimeter is one-hundreth of a  meter.  10 mm = 1 cm.  1 cm = 10mm . 14 people found this useful. Edit.
A metric ruler is use to measure centimeter and millimeters. 1 centimeter (cm) = 10 millimeters (mm) A centimeter is a unit of length in the metric system. There are 2.54 centimeters in an inch. A 12 inch ruler is about 30 cm long.