Read the passage. Then answer the question.
Tropical pitcher plants live in soil that is poor in
nutrients. To get the nutrients it needs to
survive, the plant uses a pitcher-shaped leaf as
a trap to catch and digest small organisms. But
the plant can also get nutrients from other
sources, including from the feces of woolly bats.
A woolly bat can roost, or settle to sleep, in the
upper part of the plant's trap. In the trap, the
bat is protected from predators and bad
weather. When the bat roosts, it can drop
waste, including feces, into the bottom of the
trap. The bottom of the trap holds a liquid that
helps the plant digest the feces. The plant then
absorbs nutrients from the digested feces.
U
a woolly bat approaching a tropical pitcher
plant's trap
Which type of relationship is formed when a woolly bat roosts in a tropical pitcher plant's
trap?
commensal
mutualistic
parasitic