The fingernails on the manatee are homologous structures.
Explanation:
The manatee is an animal that lives in the water, but it is not an animal that is related to the fish, instead it is a mammal. When the term mammal is mentioned, people often think of terrestrial animals, but some of the mammals are not living in the water, and have lot of characteristics that are very similar to the other marine animals. Mammals that live in water are:
Some of these mammals, like the manatee, actually have fingernails, which is very weird considering that they are of no use. The fingernails are actually homologous structures, or rather structures that have been kept from their ancestors, and can be found at many other animals with which they share common ancestor. While the ancestors of the manatee were terrestrial mammals, over time they totally transformed as they were using the water more and more, but the fingernails remained, with the main reason for that being that they are not disadvantageous, so there is no evolutionary pressure for the animal to lose them.
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Answer:
As economies advance, they require more energy. Given today's focus on greenhouse gases, coal usage will decrease. Natural gas is plentiful and is easily used for heat and as a feedstock for chemical production. Petroleum is also readily available and can be converted to energy and chemicals.
Explanation: All three resources are transportable and sources are located across the globe. However they require transportation to areas which don't have ready access. This requires roads, railways, pipelines and ships.
Answer:
Answer is D. high prices act as an incentive to increase the supply of a good , service or productive resource.
Explanation:
The market economy can be described or explained as the system where the production of goods and services are been directed or controlled by the laws of demand and supply.
This system is very considered as important , because it explained that businesses with fewer cost are more competitive and will surely make more money when compared with businesses with high cost.
This means that prices are the signal or determinant factor of goods, services and productive resource in a market economy.
Number two, because the definition of geography is :the study of physical features of the earth and its atmosphere ,and of human activity as its affected by these, including the distribution of populations and resources and companies.
