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| During his travels, Charles Darwin made numerous observations and collected evidence that led him to propose a revolutionary hypothesis about the way life changes over time. |
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| During his travels, Charles Darwin made numerous observations and collected evidence that led him to propose a revolutionary hypothesis about the way life changes over time. |
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| Hutton and Lyell helped scientists realize that Earth is many millions of years old, and the processes that changed Earth in the past are the same processes that operate in the present. |
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| Lamarck proposed that by selective use or disuse of organs, organisms acquired or lost certain traits during their lifetime. These traits could then be passed on to their offspring. Over time, this process led to change in a species. |
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| Malthus reasoned that if the human population continued to grow unchecked, sooner or later there would be insufficient living space and food for everyone. |
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| Malthus reasoned that if the human population continued to grow unchecked, sooner or later there would be insufficient living space and food for everyone. |
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| Malthus reasoned that if the human population continued to grow unchecked, sooner or later there would be insufficient living space and food for everyone. |
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| Malthus reasoned that if the human population continued to grow unchecked, sooner or later there would be insufficient living space and food for everyone. |
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