<span>Trade was important to the Sumer because there certain
resources that the Sumerians didn’t have.
These were stone, wood and metals like copper. Due to this lack of resources, the Sumerians
establish trade with other tribes as well as merchants. One is when inhabitants of the Zagros and Taurus
mountains bartered traded timber, limestone, gold, silver and copper with the
Sumerians. The Sumerians gave them wheat
and barley in exchange. Apart this,
boats were developed enabling them to transport goods for trade.</span>
Explanation:
<h3>The frequency is = 1/t = w/2π of the motion per unit time. It is measured in Hertz. (1hz = 1m/s.) </h3>
The anatomy of sponge which causes water to flow through it is the poriferan ventilation general anatomy.
Sponges do not have nerves or muscles and they do not move their only way which is relying on water flow in order to remove movement of sperm, remove gas exchange, remove wastes, and bringing food.
Because of architecture of sponge and action of choanocytes then the flow of water is being utilized efficiently by the sponge.
Water flows to spongocoel and to sponge through small openings which are found in the sponge, and out of sponge through Osculum which are the large openings.
Wind increases the supply of oxygen, which results in the fire burning more rapidly. It also removes the surface fuel moisture, which increases the drying of the fuel. Air pressure will push flames, sparks and firebrands into new fuel. ... Wind influences the rate of spread and intensity of the fire.