When biological change is gradual, as when a tortoise grows larger over its 150-year lifespan, it is an example of:

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Continuity refers to a gradual and continuous change over time, which is the case with the example of a tortoise growing larger over its 150-year lifespan. This is in contrast to discontinuity, which refers to sudden changes or developmental milestones. Genetics and nurture refer to other factors that can contribute to biological change but are not specific to gradual or sudden change.

When Biological Change Is Gradual, as When a Tortoise Grows