Is circulation an essential life process?

The circulatory system is extremely important in sustaining life.

Explanation:

Hope this helps, sorry if incorrect

lizards have adapted to life in the desert. some desert lizards have toes with spiny scales to them run across the sand without sinking. some use the sand to hide from predators, or to search for small animals that they prey upon.

if the type of the food available changes, then the frequency of beak types will change, because birds with beaks more suited to the available food will be more successful over time.