Individual organisms die, but the species continues through reproduction.
Explanation
The life cycle of an organism encompasses birth, growth, reproduction, aging, and death. While the lifespan-the period from birth to natural death-varies significantly among organisms, mortality is a certainty for every individual. Reproduction is the biological process that ensures the continuity of the species, counteracting the loss of individuals due to death.
- All organisms share an identical lifespan duration. is Incorrect: Lifespans are not identical across organisms; they vary drastically. For instance, a mayfly lives for a single day, whereas a tortoise may live for over a hundred years. Lifespan is not necessarily correlated with the size or complexity of the organism (e.g., a parrot lives much longer than a crow).
- Individual organisms die, but the species continues through reproduction. is Correct: Individual organisms are mortal and eventually die. However, through the process of reproduction, they produce offspring, ensuring that the species continues to exist generation after generation. This continuity is the primary biological purpose of reproduction.
- Organisms can achieve immortality with sufficient nutrition. is Incorrect: No individual organism is immortal, and nutrition cannot prevent natural aging and death. While single-celled organisms like Amoeba are biologically considered "immortal" because they divide to form new individuals rather than dying naturally, this is a specific exception related to cell division, not a result of nutrition.
- Mortality is a characteristic confined only to the animal kingdom. is Incorrect: Mortality is a universal characteristic of all living organisms, including plants, fungi, and microbes, not just animals.
Key Takeaway:
Reproduction is the essential biological mechanism that ensures the continuity of species, allowing life to persist despite the inevitable mortality of individual organisms.