According to the article, jellyfish are invading the oceans near JAPAN. Fisherman in the area assert that the amount of fish and jellyfish in the waters have shifted drastically during their lifetime. There is a large abundance of jellyfish (making it difficult or impossible to fish some days) and a small number of other kinds of fish.
Humans may have caused this problem by over-fishing disrupting the balance of the underwater ecosystem. Jellyfish are eaten by some fish and compete with other species of fish. Also humans building docks, bridges, and other water infrastructures have led to a decline in habitat availability for jellyfish.
Question Continuation
1. Mercury goes through a full cycle of phases
2. Moon rises in east, sets in west each day
3. Stars circle daily around north or south celestial pole
Answer:
The true statements are are (2) and (3)
2. Moon rises in east, sets in west each day.
From all part of the earth, we can see and observe the moon only that the stars move in parallel to the horizon in the north pole.
3. Stars circle daily around north or south celestial pole.
The relative position of starts are always altered because of the earth's rotation
While (1) does not really occur as seen from Earth
1. Mercury goes through a full cycle of phases
We can see the mercury from the Earth but in its whole form not in its phases.
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A net population decline resulting from an "excess of deaths over births".
Option: A
<u>Explanation</u>:
Demographic transition is a shift from higher to lower level of fertility and mortality.Rapid development in industrialization and urbanization in 
century resulted into enormous population growth. But decline in early 
century covered many reasons like consequences of two calamitous wars, where Europe suffered large population declination due to battle death and civilian causalities in World War I and II. Hence the acceleration of population growth in 19th century but downfall in 20th is also considered as balance.
Answer:
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