EVOLUTION
DARWIN’S THEORY OF NATURAL SELECTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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There are not enough members of the species born with a trait necessary to survive in the new environment
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The environmental changes mean fewer predators are around
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The change in the environment opens new resources with less competition
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There are more homes for the species in the changed environment
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Detailed explanation-1: -D. There are not enough individuals of the species that are born with traits necessary to survive in the new environment. Organisms do not survive because they were not able to adapt to the environmental change. This is because their traits are not suitable to the present conditions in their habitat.
Detailed explanation-2: -Species become endangered for two main reasons: loss of habitat and loss of genetic variation. A loss of habitat can happen naturally. Dinosaurs, for instance, lost their habitat about 65 million years ago.
Detailed explanation-3: -Habitat loss is the primary cause of higher extinction rates. Other causes include habitat changes, over-exploitation of wildlife for commercial purposes, the introduction of harmful nonnative species, pollution, and the spread of diseases.
Detailed explanation-4: -Extinction occurs when species are diminished because of environmental forces such as habitat fragmentation, climate change, natural disaster, overexploitation by humans, and pollution, or because of evolutionary changes in their members (genetic inbreeding, poor reproduction, decline in population numbers).
Detailed explanation-5: -Humans also cause other species to become extinct by hunting, overharvesting, introducing invasive species to the wild, polluting, and changing wetlands and forests to croplands and urban areas. Even the rapid growth of the human population is causing extinction by ruining natural habitats.