D) Any unwanted or discarded substances that has harmful properties
A deficiency of iodine results in <span>cretinism </span><span>in children.
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Iodine is needed by thyroid glands to make hormones. Deficiency in iodine will disrupt thyroid gland activity, resulting it works harder and the glands might be enlarged and causing hypothyroid. Thyroid glands is needed for growth, disruption in this gland will cause delayed growth (cretinism)
More than 150 years ago, inventors began working on a bright idea that would have a dramatic impact on how we use energy in our homes and offices. This invention changed the way we design buildings, increased the length of the average workday and jumpstarted new businesses. It also led to new energy breakthroughs -- from power plants and electric transmission lines to home appliances and electric motors.
Like all great inventions, the light bulb can’t be credited to one inventor. It was a series of small improvements on the ideas of previous inventors that have led to the light bulbs we use in our homes today.
