Mutualism is a long lasting, mutually beneficial interaction among organisms. Which of the following relationships best reflects mutualism? 1) A starfish provides a safe place for sea worms to reside; the starfish receives nothing in return.

2)Reef corals build a hard protective skeleton that algae live in; the algae provide energy to the coral through photosynthesis.

3)Butterflylarvae lay their eggs on jaguars and consume blood and nutrients from the jaguars.
4) Galapagos tortoises eat all the branches of cactus plants; the plant is harmed and sometimes dies.