Which statement gives an advantage for a single-celled organism

Single celled or unicellular organisms use simple processes such as diffusion and active transport to gain nutrients. iii) Unicellular organism requires less energy and makes use of simple process such as diffusion to perform gas exchange.

Explanation:

EX: Single celled or unicellular organisms use simple processes such as diffusion and active transport to gain nutrients. iii) Unicellular organism requires less energy and makes use of simple process such as diffusion to perform gas exchange

they deliver oxygen to the blood