Answer:
<h2>A. Keeping a body healthy from disease</h2>
Secondary since plants/animals already lived there, but got killed/driven out of the area they lived/thrived in/on.
This is not a concern to scientists because this is an indication that a new species may be formed or in progress from the interbreeding.
Explanation:
We know that species are the populations that can mate to produce fertile and viable progeny. Speciation occurs when new species is form by a population which has separated and become reproductively isolated.
The two dogs living in Africa and America can mate and produce healthy offsprings and they are phenotypically different.
The mating of horse and donkey are different species because they produce infertile mule.
When two population of species that are phenotypically different mate they have overcome the mechanism of reproductive isolation.
Answer:
Chemical properties are very useful in identifying substances. However, unlike physical properties, chemical properties can only be observed as the substance is in the process of being changed into a different substance.
