Answer:
The answer is C)
Explanation:
The predators were unable to keep the population of the mussels down. The mussels took more area of the rock. Other species that needed space did not return to the tidal pool. Otters can also be keystone species as they eat urchins. By doing so, they prevent the sea urchins form eating all the kelp plants and removing the entire habitat for many other species. The Keystone Species theory shows that this impact of few predators, that made up a minor amount of the total species, could have such a high impact on the ecosystem.
The Equator actually gets less hours of daylight than the other latitudes
Answer:
The study of the earth's ecosystems is also part of the physical systems element. This element includes the ways that human actions modify the physical environment. It also considers the affect that physical systems, such as landforms and weather, have on human systems.
Brazil is one of the only countries that is close to a closed a economy because it barely imports anything into its country.
<h2>
Answer: Bolivia and Paraguay</h2>
Explanation:
A landlocked country is a country surrounded by land or lacking access to the sea or the ocean, and in South America there are two countries that have this characteristic: Bolivia and Paraguay.
This is considered a geographical disadvantage, as these countries must incur higher transportation costs in import and export, compared to other countries in the region. In addition, this fact separates these countries from the wealth and commercial activities that occur on the sea coast, such as fishing and maritime trade.
It should be noted that Bolivia previously had coastline and access to the Pacific Ocean, but lost this privilege in the Pacific War, which confronted it, along with Peru, with Chile.
