After the Aswan High Dam was built on the Nile River, the rate of parasitic blood-fluke infection doubled in the human population near the dam. As a result of building the dam, the flow of the Nile changed. This changed the habitat, which resulted in an increase in its population of a certain aquatic snail. The snails, which were infected, released larvae of the fluke. These larvae then infected humans. This situation best illustrates that:

CLASSIFICATION OF PLANTS

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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

A	the influence of humans on a natural system is always negative in the long term
B	the influence of humans on a natural system can have unpredictable negative impacts
C	human alteration of an ecosystem does not need to be studied to avoid ecological disaster
D	human alteration of an ecosystem will cause pollution and loss of finite resources

Explanation:

Detailed explanation-1: -The High Dam was constructed between 1960 and 1970. Its aim was to increase the amount of hydroelectric power, regulate the flooding of the Nile and increase agricultural production. The Aswan High Dam is 3, 830 metres long, 980 metres wide at the base, 40 metres wide at the crest (the top) and 111 metres tall.

Detailed explanation-2: -Flooding of the Nile occurs annually, with almost half of the water being drained into the sea wastefully. The dam controls floods by regulating the flow of river and supplies water for irrigation throughout the year, which almost doubles the agricultural yield.

Detailed explanation-3: -The Aswan Dam solved problems of flooding and drought by opening 2.5 million acres to year-round irrigation, although some of the reclaimed land has been lost to urban expansion and shoreline erosion, and provides hydroelectric power.

There is 1 question to complete.