Median cubital vein
Median cubital vein is known
to be superficial vein of the upper limb and it is a vein that connects the
cephalic vein and basilic vein. Median cubital veinare often used for venipuncture
because they lies relatively close to the surface of the arm.
It was proposed in 465BC.
Answer:
1. (Domain)From Simple English Wikipedia, the free encyclopedia. In biological taxonomy, a domain (also superregnum, superkingdom, or empire) is a taxon in the highest rank of organisms, higher than a kingdom. Domain (or its synonyms) is the most inclusive of these biological groupings.
Answer:
C) The ancestral population probably had this type of blood pigment, but it was lost through genetic drift in the other 29 populations.
Explanation:
The presence of a blood pigment that is extraordinarily effective at carrying oxygen is a beneficial genetic trait and should be favored by natural selection. According to the given information, the organisms of only a single population of pupfish have this trait while the others do not have it.
This means that the trait was present in the ancestral populations of the pupfish but was lost in the other populations due to some accidental/chance event. Loss or fixing of an allele by a chance event is called genetic drift. It does not include any natural selection but results in a random change in the allele frequencies of a population. Therefore, loss of the trait by genetic trait might have occurred in the other populations.
In addition to several other factors, the overall risks of environmental chemicals depend on genetically determined variations in the <u>proteins</u> involved in the transport, metabolism, and excretion of these chemicals.
Environmental Chemicals
Various chemicals and compounds present in the air, food, soil, water, dust, etc are called environmental chemicals. In humans, there are more than 400 listed environmental chemicals. Most of these chemicals are already present in the environment while the others were manufactured for humans to use. Some chemicals may be harmful to all humans while others may be selectively harmful to certain individuals and they are commonly referred to as allergens. Even though there are many environmental chemicals around a human being, most of them are not harmful.
The risks involved in exposure to chemicals depend on variations in the proteins present in various metabolic functions. If the functions of the proteins are hampered then it will create a cascade of errors that may end up causing serious harm to the person.
Learn more about the environment here:
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