That can't be true, your brain has clearly been deprived of oxygen for decades.
But also you can move oxygen through the body without one. Insects, mollusks, etc.
Ok. Your body has a circulatory system. This is used to move oxygen rich blood cells through every part of your body. Now, here's a question for you. A circulatory system is useless without blood. Also, blood has no reason to exist without one. So which came first? Blood or our circulatory system? The answer is neither. They were created at the same time. There is no other rational explanation.
That can't be true, your brain has clearly been deprived of oxygen for decades.
But also you can move oxygen through the body without one. Insects, mollusks, etc.
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Crazy Cat Lady (12-21-2018), evince (12-26-2018), FUCK THE POLICE (12-21-2018), JqYaqui (12-22-2018), kudzu (12-21-2018), Phantasmal (12-21-2018)
Crazy Cat Lady (12-21-2018), evince (12-26-2018)
Neither one of which is a warm-blooded mammal. The question still remains. Blood could not evolve without a circulatory system. A circulatory system could not evolve without blood to circulate. It's a catch-22. You cant have one without the other, and they could not evolve separately.
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Rune (12-24-2018)
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Fentoine Lum (12-21-2018), Mott the Hoople (12-21-2018)
Stay on topic. We're discussing warm-blooded mammals. Can you explain how our blood and circulatory system supposedly evolved? The question is still valid found species that don't use blood. A circulatory system needs something to circulate before it has any excuse to evolve.
Circulatory System Variation in Animals
https://courses.lumenlearning.com/wm...on-in-animals/
The circulatory system varies from simple systems in invertebrates to more complex systems in vertebrates. The simplest animals, such as the sponges (Porifera) and rotifers (Rotifera), do not need a circulatory system because diffusion allows adequate exchange of water, nutrients, and waste, as well as dissolved gases, as shown in Figure 1a. Organisms that are more complex but still only have two layers of cells in their body plan, such as jellies (Cnidaria) and comb jellies (Ctenophora) also use diffusion through their epidermis and internally through the gastrovascular compartment. Both their internal and external tissues are bathed in an aqueous environment and exchange fluids by diffusion on both sides, as illustrated in Figure 1b. Exchange of fluids is assisted by the pulsing of the jellyfish body.
For more complex organisms, diffusion is not efficient for cycling gases, nutrients, and waste effectively through the body; therefore, more complex circulatory systems evolved. Most arthropods and many mollusks have open circulatory systems. In an open system, an elongated beating heart pushes the hemolymph through the body and muscle contractions help to move fluids. The larger more complex crustaceans, including lobsters, have developed arterial-like vessels to push blood through their bodies, and the most active mollusks, such as squids, have evolved a closed circulatory system and are able to move rapidly to catch prey. Closed circulatory systems are a characteristic of vertebrates; however, there are significant differences in the structure of the heart and the circulation of blood between the different vertebrate groups due to adaptation during evolution and associated differences in anatomy. Figures 2 and 3 illustrates the basic circulatory systems of some vertebrates: fish, amphibians, reptiles, and mammals.
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