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The “kinds” of animals that were chosen are not the same as the modern day term “species.” The account says they were chosen “according to their kinds.” In fact, over a million species can be reduced to a few “kinds.” You have the dog “kind”, the horse “kind” and the cow “kind”, to mention just a few. With this in mind, it is estimated that there were 43 kinds of mammals, 74 kinds of birds, and 10 kinds of reptiles, which over the last 4,400 years has produced the variety of species that we now have. Moreover, the sea animals could have stayed in the sea. Finally, Noah could have taken most of the larger “kinds” in when they were small, and there would have been plenty of room.
The Ark described in the Book of Genesis was a large vessel that God commanded Noah to build in order to preserve the lives of animals and humans during a great flood. The exact dimensions of the Ark are given in the Bible as 300 cubits in length, 50 cubits in width, and 30 cubits in height, which is approximately 450 feet long, 75 feet wide, and 45 feet tall. It is important to note that the account of the Ark and the flood in the Book of Genesis is an account from the Hebrew Bible. Its purpose is not necessarily to provide a scientific explanation of events.
However, it is possible that the Ark could have held a large number of different kinds of animals, as many of these animals would have been young and would have required relatively little space. In addition, the Ark may have had multiple levels or compartments in which animals could be housed. It is also possible that the Ark was stocked with food and other supplies to sustain the animals and humans on board during their journey.