An adaptation is a characteristic to help an animal make a better fit in an environment.
Three marine adaptations that have developed include: interior gills, movement with: legs, tentacles, and fins, and a swim bladder.
Movement and specialized limbs: Muscular foot, tube feet, siphon, cilia.
Specialized eye structures: Ommatophores, tubular eyes, tapetum lucidium, increased rod cells.
Catching prey: Amullae of lorenzi, illicium.
Avoiding predators: Thick skin, shells, setae, toxin, claws, inking, mucus bubble, inflation.
Camouflage: blending in with the environment. Counter shading: coloration change between night and day or dark and light.
Bioluminescence: energy released in the form of light. Advantages: attract prey, camouflage, avoid predation, communication, attract mates. 90% of deep-sea creatures use bioluminescence.
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