I think metastasis is a secondary tumor in a different part of the body that arises from a cells from the primary tumor. Metastasis means the spread of cancer cells. Cancer cells may break away from a primary tumor and enter the bloodstream or lymphatic system and is then spread to other parts of the body.
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Answer:
Differential reproduction leads to a change in allele frequencies over time. This occurs because of natural selection favoring "successful" individuals that produce more viable offspring.
The sickle-cell allele is maintained in populations exposed to malaria through balancing selection, since heterozygous individuals have protection against the disease.
Answer: A. Does the wave require a medium to travel.
Explanation:
Mechanical waves require the presence of a material object to be able to engage in energy transfer. For example, Sound is a mechanical wave that needs a medium to travel such as a solid or liquid.
Electromagnetic waves on the other hand, are able to travel through a Vacuum including that of space and they include all light waves. This is why the sun's light is capable of reaching Earth.
Nephron help in regulating fluid and electrolyte by balancing and continually filtering the blood. This is vital to maintain a constant extracellular fluid volume and composition.