Single-celled animals must passively absorb nutrients and oxygen from their surroundings, unlike humans who have lungs to pump air in and out and a heart to distribute the oxygenated blood throughout their bodies.
(Single-celled animals; must passively absorb; nutrients) (humans; have; lungs to pump air in and out) Context(humans have,List([97, 112))):(humans who have lungs; to pump; air; in and out)
humans have,List([97, 112))
Single-celled animals humans humans who have lungs
must passively absorb have to pump
nutrients
lungs to pump air in and out
air in and out