Because the urchin life involves two or more ecological niches, they are more susceptible to predation and exposure to environmental toxins. What environmental conditions, predators and toxins might they be exposed to at each stage?

Sea urchins are spiny animals found in the aquatic habitat. They have similarities as the hedgehog and are referred to as Sea hedgehog.They feed on algae.

They are exposed to these conditions which include:

Environmental conditions- Changing water temperature and algal bloom

Predators- Crabs, Eels, Fish, Sea otters, Bird, Man

Environmental Toxins- Irgarol, Diuron, Polychlorinated biphenyl congeners.

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-lavira : )

not necessarily. higher fitness requires the organism to be reproductive successful. for example, an organism at age 10 with 15 offspring is much more fit than an organism at age 15 with only 5 offspring.