Question

what are the needs of living things
cells, dna, reproduce, obtain & use energy, respond to stimuli, grow & develop
biotic and abiotic
homeostasis
water, air (gas exchange), shelter (space), food

Explanation:

Living things need water for biochemical reactions, air for gas - exchange (respiration), shelter for protection and space, and food for energy and nutrients. These are basic environmental requirements for survival.

Answer:

water, air (gas exchange), shelter (space), food