The term for an organism's ability to change with environmental conditions is phenotypic plasticity. This capacity allows organisms to exhibit different physical or behavioral traits in response to varying environmental challenges. For instance, plants might adjust leaf size or coloration based on light availability, while animals may change behavior or morphology to adapt to temperature fluctuations. Phenotypic plasticity is crucial for survival in dynamic ecosystems, as it enhances the adaptability of species facing climate change and other environmental stresses.