Question

criteria to something is alive

Answer 1

Living things only are complex organisation of molecules , which perform certain life processes such as :
Growth
Metabolism
Reproduction etc

Answer 2

The criteria we use to decide whether something is alive or not are:-

♤ Whether there is a movement

♤ Respiration

♤ Respond to stimuli

♤ Exhibits growth & development

♤ It remove its metabolic wastes