25 POINTS!!
WORD BANK: adaptation, biologist, control group, cycle, environment, experimental group, hypothesis, law of conservation of energy, reproduction, speciation, species, theory

A(n) ________ is a course or event that repeats and usually leads back to the starting point.

Respuesta :

A(n) cycle is a course or event that repeats and usually leads back to the starting point.

the answer is cycle because a cycle goes in circle so it leads back to it's self