Examlex
Which of these embryonic structures is NOT paired with the correct primary germ layer from which it develops?
Competitive Exclusion
A principle stating that two species competing for the same resources cannot coexist permanently if their ecological niches are identical.
Character Displacement
A phenomenon where differences among similar species whose distributions overlap geographically are accentuated in regions where the species co-occur but are minimized or lost where the species' distributions do not overlap.
Keystone Species
A species that has a disproportionately large effect on its ecosystem, influencing the types and numbers of other species in a community.
Sea Stars
Sea stars, also known as starfish, are marine invertebrates belonging to the class Asteroidea, known for their radial symmetry and a body plan consisting of a central disc from which arms (or rays) extend.
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