Strategic minerals are resources or elements that are important to everyday life because it can be a source of renewable energy and are used in manufacturing household items, equipment regarding national security, and agricultural production.
Africa is leading worldwide in terms of abundance of strategic minerals like diamond, platinum, chromium and many more. Other essential minerals such as gold, silver, copper and colored gemstones are critical minerals are imported from Afghanistan.
<span>Contact lens solution is sterile when it is new in the bottle, but when opened it can become contaminated in a few days depending on conditions. The inside of a personal contact lens case is often very dirty.</span>
Biological evolution is the process through which the characteristic of organisms change over successive generations, by means of genetic variation and natural selection. It is most commonly defined as "changes in gene frequencies in populations".
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Answer:
The correct answer is Zones of tolerance
Explanation:
All living organisms such as fish,plants and animals need water to survive and also the require certain pH level of water in order to be healthy.Its a acid and base balance reaction.Strong acids dissolve into water and its changes water's pH.if water's pH level drops it becomes acidic suppose a fish waste ammonia releases and dissolves in water to form harmless ammonia ions,carbon dioxide ions and hydrogen ions even some limestone also rises pH level and water becomes more basic.To make the tank water alkaline, add some corals and aerate the tank water by fixing an air pump so that excess of carbon dioxide eliminate out and water pH level comes to neutral this is the reason water becomes slightly alkaline and the fishes are able to reproduce.
