<span>Answer: C low income countries
According to a new article in Business Insider, Cities lie Berlin, London, etc have low rates of traffic accidents while many African cities have a high rate of Traffic accidents due to poor infrastructure. New York's grid system works wonders at avoiding accidents. The number of accidents in Brazil is 8.5 times higher than that of New York.</span>
According to MacArthur and Wilson's theory of island biogeography, the following is correct:
a. The number of species decreases with island isolation.
A good answer would be "caste". A caste system is the social hierarchy in India in which people are first assigned one of the four main castes (scholars, warriors, farmers, servers) and then additionally often also to smaller castes (farmers of rice, of bananas). The social mobility is very low.
Bc everything in it serves as a purpose that makes it run smoothly like spiders eat insects and birds eats sliders and snakes so on and so fourth thus making it a system
