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Fish:
·
Fish breathe using gills,
which are specialized organs.
·
Gills extract dissolved
oxygen from water.
·
Water enters through the fish’s
mouth, passes over the gills, and oxygen diffuses into the blood, while carbon
dioxide diffuses out into the water.
·
Gills have many thin filaments
with a large surface area to absorb oxygen efficiently.
Earthworms:
·
Earthworms breathe through their skin.
·
Their skin must remain moist
to allow oxygen to dissolve and diffuse into their blood vessels through the
skin.
·
Oxygen is absorbed directly, and
carbon dioxide is released the same way.
·
Earthworms live in moist soil to
keep their skin wet for effective gas exchange.
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