Answer: Rightly so, every place experience scarcity or shortages of some sort.
Scarcity can be defined as a lack or deficiency of something. It is a situation whereby something that is readily available is in an inadequate amount.
West Africa, Nigeria, one of the scarcity experienced here is electricity.
In Nigeria, about 40,000 megawatts is needed to sustain the basic population but only about 5,000 megawatts is readily available, that is just 12.5% of the total needed. This a clear definition of scarcity.
Answer:
B. They break down rotting materials and return nutrients to the soil.
An isometric contraction is the kind of contraction that leads to development of tension but no increase in length.
An isometric contraction occurs as the muscle produces tension without changing the angle of a skeletal joint. Isometric contraction is a static muscle action that helps to maintain the posture. For example, the antigravity muscles. It occurs in the biceps when the arms may be holding a weight. In such a posture, the biceps enlarge due to holding of weight and produces tension but do no increase in length. It stops the flexion of elbow. In such contraction, no work is done, and lesser amount of heat energy is released in comparison to isotonic contractions.
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