The carbon cycles in the atmosphere and the ocean play a crucial role in regulating Earth's climate.

The duty cycles of the two machines are different.

Female mammals experience multiple estrous cycles throughout their reproductive years.

The system exhibits multiple limit cycles.

The lytic cycles of the virus are responsible for the destruction of host cells.

The lysogenic cycles play a crucial role in the life cycle of the bacteriophage.

Phosphorus cycles play a crucial role in the ecosystem.

The uterine cycles of mammals vary in length.

The Sothic cycles occur every 1461 years.

The interval cycles in this piece create a sense of tension and release.