Interest groups help democracy because they represent the interests of such large numbers of people and encourage political participation by many groups. Some obstacles that interest groups face is the fact that not all interests are represented equally. Many popular interests never get organized and/or recognized.
Answer: Ethnology
Explanation:
Ethnology goes hand in hand with Ethnography with both of them falling under Anthropology. While Ethnography tries to describe people in relation to their customs and cultures from a scientific perspective, it is up to Ethnology to examine and interpret the results that come in from Ethnography.
It does this and then presents the results as the similarities and differences between people of various cultures and traditions.
The problem starts already earlier:wildlife experts can only estimate the number of species in the world generally!
This is the case because there are simply too many species, and it takes time to documents them; because some areas (ocean bottom for example) are very hard to access and because sometimes it's hard to know whether we're talking about a new species or a variation within the same species.
so if we even don't know how many species there are, it's even harder to know how many are endangered.
Answer:
Conservation of mechanical energy
Explanation:
Law of Conservation of Mechanical Energy: The total amount of mechanical energy, in a closed system in the absence of dissipative forces (e.g. friction, air resistance), remains constant.
In the absence of air resistance, the mechanical energy of an object moving through the air in the Earth's gravitational field, remains constant (is conserved) while the opposite is the case when there is air resistance involved.
Heat is what causes atoms to move at different speeds. The hotter it is the faster they move.