Three seismic stations are needed to determine the location of an earthquake's epicenter.
uplift-weathering-erosion-subsidence
Answer:
Strategies to reduce desertification
Planting more trees - the roots of trees hold the soil together and help to reduce soil erosion from wind and rain. Improving the quality of the soil - this can be managed by encouraging people to reduce the number of grazing animals they have and grow crops instead.
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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