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The rate of appearance of new life forms...

The rate of appearance of new life forms is linked to their

A

Acquired traits

B

Nonheritable characters

C

Life span

D

Cranial capacities

Text Solution

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The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding the Question**: The question asks about the factors that influence the rate at which new life forms appear. This involves understanding the concepts of speciation and the characteristics that contribute to the emergence of new species. 2. **Analyzing the Options**: - **Acquired Traits**: These are characteristics gained during an individual's lifetime and are not inherited by offspring. For example, a bodybuilder's muscular build is an acquired trait. Since these traits do not get passed on genetically, they do not contribute to the appearance of new life forms. - **Non-Heritable Characters**: Similar to acquired traits, these characters cannot be inherited. Changes that occur during an individual's life do not affect the genetic makeup of the next generation, thus they also do not lead to new life forms. - **Lifespan**: Lifespan refers to the duration from birth to death. Organisms with shorter lifespans tend to reproduce more quickly and may undergo mutations at a higher rate, leading to the potential for new species to emerge more rapidly. In contrast, organisms with longer lifespans, like humans, have a slower rate of speciation due to longer generation times and more complex evolutionary changes. - **Cranial Capacity**: This refers to the size of the brain and is a trait that can be inherited. However, it does not directly relate to the rate of appearance of new life forms. 3. **Conclusion**: After analyzing all options, the most relevant factor influencing the rate of appearance of new life forms is **lifespan**. Organisms with shorter lifespans can undergo mutations and reproduce more rapidly, leading to a higher rate of speciation. 4. **Final Answer**: The correct option is **C. Lifespan**. ---
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