In a rapid early ice age, many species died out that had persisted for a very long period of stable environmental conditions. After a long ice age, volcanoes emerged from the ice, filling the atmosphere with gasses, which trapped the suns heat, warming the earth. The fossil record shows thousands of new species emerged during this time, seemingly all at once, calling it the Cambrian Explosion. This is best known as:

EVOLUTION

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

In a rapid early ice age, many species died out that had persisted for a very long period of stable environmental conditions. After a long ice age, volcanoes emerged from the ice, filling the atmosphere with gasses, which trapped the sun’s heat, warming the earth. The fossil record shows thousands of new species emerged during this time, seemingly all at once, calling it the Cambrian Explosion. This is best known as:

A	Gradualism
B	Punctuated Equilibrium
C	Hardy-weinburg principle
D	Adaptive radiation

Explanation:

Detailed explanation-1: -We show that the large 1257 Samalas, 1452 Kuwae, and 1600 Huaynaputina volcanic eruptions were the main causes of the multi-centennial glaciation associated with the Little Ice Age.

Detailed explanation-2: -Ice ages can occur when we are further from the Sun. Sun-The amount of energy output by the Sun also changes. Low cycles of energy output can help in producing an ice age. Atmosphere-Low levels of greenhouse gases such as carbon dioxide can cause the Earth to cool leading to an ice age.

Detailed explanation-3: -Winters were bitterly cold and summers were often cool and wet. These conditions led to widespread crop failure, famine, and population decline. The tree line and snowline dropped and glaciers advanced, overrunning towns and farms in the process.

Detailed explanation-4: -In general, it is felt that ice ages are caused by a chain reaction of positive feedbacks triggered by periodic changes in the Earth’s orbit around the Sun. These feedbacks, involving the spread of ice and the release of greenhouse gases, work in reverse to warm the Earth up again when the orbital cycle shifts back.

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LIFE SCIENCE

OBJECTIVE LIFE SCIENCE

EVOLUTION