Answer:
The starfish Pisaster ochraceus is a keystone species in the rocky marine intertidal communities off the northwest coast of North America. This predatory starfish feeds on the mussel Mytilus californianus and is responsible for maintaining much of the local diversity of species within certain communities. A keystone species is an organism that helps define an entire ecosystem. Without its keystone species, the ecosystem would be dramatically different or cease to exist altogether. This means that if the species were to disappear from the ecosystem, no other species would be able to fill its ecological niche.
Explanation:
Hope this helps!
Answer: It is important to control the variables so the evidence from the experiment are as accurate as possible.
Answer:
plants provide shelter and air for the animals
and when animals die they decompose and become fertilizer for the plant
Smog. Im pretty sure smog is the only unhealthful air pollution on this list.
