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The correct answer is - quartz.
The quartz is a light colored, transparent mineral, with hardness of seven, and is characteristic that instead of cleaves it has fractures. This mineral is composed of silicon and oxygen atoms, which make a tetrahedral structure. It is the second most abundant mineral in the Earth's crust, just after the feldspar.
Dominant traits are always expressed when the connected allele is dominant, even if only one copy of the dominant trait exists. Recessive traits are expressed only if both the connected alleles are recessive.
Answer:
The correct option is A.<u><em> Normal microbiota may significantly impact human health and disease.</em></u>
Explanation:
A wide number of microorganisms are present on or inside of our body. All these microorganisms make up the natural microbiota. The normal microbiota is very important to maintain the health of the host.
However, any microbial imbalance can lead to causing disease in its host. The microbiota of the gut have a disease-promoting effect but can also have protective properties. Differences in this microbiota can lead to serious conditions.
