Vestigial structures. These are structural elements that once served a purpose but as the organism evolved now serves no purpose.
This is called a chemical bond.
Answer:
Gene flow.
Explanation:
When individuals migrate, alleles can be transferred from one population to another population which is known as gene flow. Gene flow is also called gene migration, the introduction of genetic material through interbreeding from one population of organisms to another which changes the composition of the gene pool of the migrated population of organisms. This gene flow creates a new species that is different from previous population of organisms
Narcotic drugs are analgesic that exert a depressing action on the central nervous system.
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Johannes Kepler was the one who elucidated the 3 laws of planetary orbits, the chief one being the elliptical orbits of the planets around the sun with the sun at a focal point at one end of the orbits. This was derived especially from careful observations by Tycho Brahe of the heavens and based on his model of the orbits so was scientifically based.
