Some are secondary consumers or second-order consumers, meaning that they eat primary consumers. Snakes that eat mice (primary consumers) are secondary consumers. Other higher-level consumers are tertiary consumers or third-order consumers, and eat further up on the food web or perhaps on many levels.Examples of third-order consumers are mountain lions and hawks, both of whom eat second-order consumers such as snakes and owls. food web differs from a food chain in that it includes all the organisms whose feeding habits are related in some way or another to those of other organisms. In the example above, small animals other than rabbits feed on lettuce and carrots and, in turn, those animals are fed upon by a variety of larger animals.
There are no quotas for persons into the U.S. seeking citizenship. The quotas are for Visas...in particular, Work visas AND Immigratn Visas. The status of legal permenent residence in the U.S. is a VISA class. Most people do not know this.
Status as a natural-born citizen of the United States is one of the eligibility requirements established in the United States Constitution for election to the office of President or Vice President. This requirement was intended to protect the nation from foreign influence.