The idea that species evolve at a slow constant rate is called?

The idea that species evolve at a slow constant rate is called gradualism.

Gradualism is a theory which maintains that evolution of species proceeds continuously at a steady pace, without the sudden development of new species or biological features from one generation to the next. The approach in which Charles Darwin deduced the emergence of one species from another species over geologic time has been attributed to gradualism.

answer: wheres the options

explanation:

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.