Examlex
Operating leverage increases with fixed cost.
Reproductive Barrier
Biological features or mechanisms that prevent species from breeding with each other, maintaining species distinctiveness.
Gametic Incompatibility
Occurs when sperm or pollen from one species fails to penetrate and fertilize the egg or ovule of another species.
Reproductive Isolation
A collection of mechanisms, behaviors, and physiological processes that prevent the members of two different species from producing offspring, or ensure any offspring are sterile.
Hummingbirds
A family of small, brightly colored birds known for their rapid wingbeat, ability to hover, and preference for feeding on nectar.
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