Answer:
Case-Control Study
Explanation:
A case–control study is a type of observational study in which two existing groups differing in outcome are identified and compared on the basis of some supposed causal attribute
Marginal beneficit and marginal cost are economic concepts. On the one hand, the marginal beneficit is defined as the added satisfaction a consumer gets from an additional unit of a good or service. On the other hand, the marginal cost is the change in total cost that results from making or producing one additional item.
The consumer could use these measurements to consider whether the cost is higher than the benefit when purchasing an item or getting a new service. Do they really need to buy an extra t-shirt when they already have enough of them? The benefit would be that they would get another t-shirt. In addition, as this is a new piece of clothing, it would probably be more in fashion than the old ones. However, the consumer would have to spend an amount of money that perhaps he had saved for another purpose and consequently would lack money for it. If he decided not to buy the t- shirt, he would have said amount of money to pay for his taxes or services. The same applies when it comes to the extra smoothie. The amount of money spent on the smoothie could be used to get something else and, by getting an extra one, you would feel fuller and perhaps would not eat a proper meal afterwards. You could also gain weight if the smoothie is not healthy, so in the end the cost is higher than the benefit.
Therefore, you could easily apply economic concepts, such as the ones described, in your everyday life so as to make decisions that leave you better off. By considering the cost associated with an extra purchase, you could start saving up money. Eventually, you could spend your savings to get a greater benefit. For instance, you could go on vacation without spending your salary and still comply with the payment of your taxes and services.
Mutualism is an ecological relationship where two-member benefits (Option 2).
<h3>What is an ecological relationship?</h3>
An ecological relationship is an association between two or more species, which may have positive, negative or neutral outcomes.
Mutualism is a symbiotic ecological relationship because both species are benefited from such interaction.
In conclusion, mutualism is an ecological relationship where two-member benefits (Option 2).
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Africa is a continent of great size, almost 12 million square miles or
about three times the size of the United States. Most of it lies in the
tropics and, although we often think of Africa in terms of its rain forests,
less than ten percent of the continent is covered by tropical forests, and
those are mostly in West Africa. Much of the African surface is covered by
savannas, or open grasslands, and by arid plains and deserts. In geological
terms, the continent is really formed by a series of high plateaus broken in
the east by the Great Rift valley and the mountains that surround it. Large
rivers - the Congo, the Nile, the Zambezi, and the Niger - begin in the
interior of the continent and flow to the sea over great falls and cataracts
that mark the passage from the plateau to the coast. These falls have
historically made movement from the coast to the interior difficult, but the
great river systems have also provided the interior of Africa with routes of
communication.