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There was a horse in the land and a sea-horse in the sea. For that matter there was probably a Pegasus in heaven". [3] The idea of perfect analogies in the fauna of land and sea was considered part of the perfect symmetry [4] of the Creator's plan, offered as the "book of nature" to mankind, for which a text could be found in Job:
From shallow waters to the deep sea, the open ocean to rivers and lakes, numerous terrestrial and marine species depend on the surface ecosystem and the organisms found there. [ 28 ] The ocean's surface acts like a skin between the atmosphere above and the water below, and harbours an ecosystem unique to this environment.
Marine mammal adaptation to an aquatic lifestyle varies considerably between species. Both cetaceans and sirenians are fully aquatic and therefore are obligate water dwellers. Pinnipeds are semiaquatic; they spend the majority of their time in the water but need to return to land for important activities such as mating, breeding and molting.
Marine biology is the scientific study of the biology of marine life, organisms that inhabit the sea.Given that in biology many phyla, families and genera have some species that live in the sea and others that live on land, marine biology classifies species based on the environment rather than on taxonomy.
Marine life, sea life or ocean life is the collective ecological communities that encompass all aquatic animals, plants, algae, fungi, protists, single-celled microorganisms and associated viruses living in the saline water of marine habitats, either the sea water of marginal seas and oceans, or the brackish water of coastal wetlands, lagoons ...
Marine iguana: marine iguanas live only on the Galápagos Islands and are not fully adapted to marine life. Although they feed exclusively on marine plants and spend a good deal of their time in the water, they do nest on land and need to bask in the sun to reach their ideal body temperature; they are thus also subject to terrestrial predators.
A modern semi-aquatic lizard: the marine iguana. Modern squamates which have made their own adaptions to allow them to spend significant time in the ocean include marine iguanas and sea snakes. Sea snakes are extensively adapted to the marine environment, giving birth to live offspring and are largely incapable of terrestrial activity.
Disteira major (Olive-headed or greater sea snake) Disteira nigrocincta Disteira walli (Wall's sea snake) Enhydrina schistosa (Beaked sea snake, hook-nosed sea snake, common sea snake, Valakadyn sea snake) Enhydrina zweifeli (Sepik or Zweifel’s beaked seasnake) Hydrophis; Hydrophis belcheri (Faint-banded sea snake, Belcher's sea snake)