There are two basic life-cycle patterns among animals. Many animals have complex life cycles with two or more very distinct stages; metamorphosis is the usual term for the often-radical changes that ...

Researchers uncover for the first time the mechanism that likely explains how embryos form either a larva or a miniature version of the adult. For over 100 years, biologists have wondered why animals ...

From tadpole to frog caterpillar to butterfly and pup to wolf children will learn about the life cycles of animals the different stages of development and the average life spans of a variety of ...

Cell division is one of the most fundamental processes of life. From bacteria to blue whales, every living being on Earth relies on cell division for growth, reproduction, and species survival. Yet, ...

Under stressful conditions, the ctenophore Mnemiopsis leidyi can revert from a lobate adult stage to a cyddipid larva, depicted here. Animal life cycles typically follow a familiar pattern, declined ...