Algae and other microscopic organisms form periphyton, which attaches to limestone.

Many multicellular organisms form spores during their biological life cycle in a process called sporogenesis.

The organisms responsible for primary production are known as primary producers or autotrophs, and form the base of the food chain.

The organisms form three distinct assemblages, increasing in size and complexity as time progresses.

However, some organisms will form single-species films under certain conditions.

Most organisms form two different types of gametes.

Those organisms may have formed their hard parts in subtly different ways, a phenomenon experts call "vital effects."

Bottom-dwelling organisms form the most varied group in the ocean.

This is more true than you may have intended; organisms form symbiotic relationships in a variety of ways.

It is observable that most organisms form groups in order to enhance their chances of survival.