Which of the following best describes a complex life cycle?

A complex life cycle is characterized by having two or more distinctive stages that often occur in different habitats. Many organisms, particularly amphibians and insects, exhibit such life cycles. For instance, a frog starts its life as an egg in water, then develops into a tadpole (also aquatic), and eventually metamorphoses into an adult frog that can live on land. These different life stages are adapted to specific environmental conditions and utilize resources available in those habitats, highlighting the importance of habitat diversity in the life cycle.

The other options do not accurately capture the essence of a complex life cycle. Rapid changes without distinct phases (the second choice) suggest a more straightforward development process, which does not align with the concept of transformation through distinct stages. The third choice, which states that a complex life cycle involves no environmental changes, contrasts with the definition, as environmental shifts are often critical for the transition between life stages. Lastly, the option that restricts life stages to either ground-dwelling or aquatic life overlooks many organisms that thrive in multiple environments, emphasizing the variety seen in complex life cycles.