<span>Technology is one reason why the shire horse is in decline. With the main job that they did being farmwork, and many of these tasks being taken over by mechanized means, the number of breeders of these horses has declined and the number of horses therefore available has dipped, as well.</span>
B because I’m pretty sure only whales and dolphins have blowholes
Answer: There are 206 bones in the human adult body, but 270 bones at birth.
The drug that kills bacteria is antibiotic with have antibodies that fight off diseases
Answer:
The biologist is analyzing deleterious and beneficial mutations.
Explanation:
In general, mutations are deleterious genetic changes that negatively affect the fitness of the individual in a particular environment. However, there are occasions where a mutation may be beneficial. These mutations are beneficial because they confer an adaptive advantage (for example, by generating new versions of proteins) that enable the individual to adapt to their environment, thereby increasing their chances to survive and reproduce. If a beneficial mutation is new it will be distributed disproportionately among populations, thereby it is possible to determine the novelty by determining the frequency of the mutation among populations. Ideally, this new mutation should have a value of 0 in the non-target populations (i.e., this mutation does not exist in these populations), and a very low value in the target population (i.e., this mutation appeared very recently). Since mutations provide the raw material for natural selection, it is expected that a new mutation increases their frequency in the population, but if this genetic change is deleterious in a particular environment, natural selection will decrease their frequency. Deleterious mutations are accumulated in populations with small sizes faster than it can eliminate them, thereby the identification of these genetic changes can result useful for the design of conservation strategies in endangered species.
