{"id":105273,"date":"2023-06-09T21:43:00","date_gmt":"2023-06-10T01:43:00","guid":{"rendered":"https:\/\/www.shortform.com\/blog\/?p=105273"},"modified":"2023-06-15T10:51:05","modified_gmt":"2023-06-15T14:51:05","slug":"evolution-of-complexity","status":"publish","type":"post","link":"https:\/\/www.shortform.com\/blog\/evolution-of-complexity\/","title":{"rendered":"The Evolution of Complexity: Charles Darwin Responds to Critics"},"content":{"rendered":"\n<p>How could something as complex as the human brain have evolved from a simpler structure? Does evolution naturally produce complexity?<\/p>\n\n\n\n<p>When Charles Darwin published <em>On the Origin of Species<\/em>, some scientists brought up a challenge to his theory of evolution: Complex features are difficult (if not impossible) to create through small increments as Darwin had suggested. In the last edition of his book, Darwin responded.<\/p>\n\n\n\n<p>Keep reading to learn about the evolution of complexity.<\/p>\n\n\n\n<!--more-->\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-the-evolution-of-complexity\">The Evolution of Complexity<\/h2>\n\n\n\n<p>Darwin explains that <strong>some naturalists found it difficult to believe that very sophisticated structures could arise through small increments.<\/strong> Organisms today have such highly developed structures and behaviors that it&#8217;s hard to imagine a rudimentary version of them providing much value.&nbsp;<\/p>\n\n\n\n<p>For example, bats hunt using <a href=\"https:\/\/www.shortform.com\/blog\/animal-echolocation\/\">echolocation<\/a>. They emit high-pitched sound waves that bounce off insects and then they judge the distance and direction of the prey by listening to the echo. They do this fast enough to intercept insects in flight. That means echolocation needs to work at a high level of sophistication if it\u2019s to work at all<em>.<\/em> It&#8217;s hard to imagine a primitive bat just making noises and then trying to follow the direction of the echo.&nbsp;<\/p>\n\n\n\n<p>Darwin provides two rebuttals to this argument and explains the evolution of complexity.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-rebuttal-1-evolution-repurposes-older-structures\">Rebuttal 1) Evolution Repurposes Older Structures<\/h3>\n\n\n\n<p>Darwin argues that <strong>highly sophisticated structures and instincts can evolve incrementally, but they\u2019re often <em>repurposed from earlier structures<\/em>.<\/strong> An earlier version of a species may evolve a structure for one purpose. Then, the organism finds a new use that allows the structure to continue evolving into greater complexity and sophistication.<\/p>\n\n\n\n<p>Let\u2019s return to the echolocation example. To echolocate, bats need highly sensitive directional hearing and the ability to make high-frequency sounds. These could\u2019ve developed independently of each other before being repurposed into an echolocation system.&nbsp;<\/p>\n\n\n\n<p>Bats may have started off like other nocturnal predators, such as owls, that hunt using highly sensitive directional hearing. They may also have communicated with each other using ultra-high-frequency squeaks that predators can\u2019t hear, as many small rodents do today. Once early bats derived even a small advantage from using these abilities together in echolocation, evolution could then incrementally improve on this new usage.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td><strong>The Mechanisms of Evolving Complex Organs<\/strong><br><br>Researchers have named the process of repurposing structures <em><a href=\"https:\/\/www.shortform.com\/blog\/what-is-exaptation\/\">exaptation<\/a><\/em>. However, exaptation is only one of several processes that enable complex organs to evolve. Evolutionary biologists have identified <a href=\"https:\/\/evolution-outreach.biomedcentral.com\/articles\/10.1007\/s12052-008-0076-1\" target=\"_blank\" rel=\"noreferrer noopener\">several more key mechanisms for evolving complex structures<\/a>.<br><br><strong>Duplication<\/strong> creates copies of genes and repurposes them. A complex structure may begin as a crude copy of another structure before adapting to a new function.<br><br><strong>Scaffolding<\/strong> allows structures to support the development of other structures before losing their functions\u2014much like the scaffold in a construction project.<br><br><strong>Gene sharing<\/strong> allows one set of genes to take on multiple functions. This increases the complexity and range of organic structures that can be supported by an organism\u2019s genetic code.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-rebuttal-2-the-natural-world-shows-incremental-development-of-complex-structures\">Rebuttal 2) The Natural World Shows Incremental Development of Complex Structures<\/h3>\n\n\n\n<p>Furthermore, Darwin argues that, <strong>when we look at simpler organisms, we often find earlier versions of rudimentary structures that developed into much more complex structures over time. <\/strong>For example, the human brain is so complex that scientists are still discovering how it works. However, by understanding that the brain is a centralized collection of nerve cells in communication with each other, we can find the simplest examples of this structure in nature to reveal how it may have developed over time.&nbsp;<\/p>\n\n\n\n<p>One of the simplest nerve cell structures belongs to jellyfish, whose nerve cells connect in a &#8220;net&#8221; that senses and processes information. One step up from this we find hydras, small freshwater relatives of sea anemones. These creatures also have a nerve net, but their nerve cells are more specialized, giving them something closer to a brain. Finally, in flatworms, these specialized nerve cells cluster together, forming a simple brain that can make decisions and even remember previous actions. By looking at these <a href=\"https:\/\/www.shortform.com\/blog\/simple-organisms\/\">simple organisms<\/a>, we can infer the origins of something as complex as a human brain.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td><strong>Does Evolution Naturally Produce Complexity?<\/strong><br><br>Some evolutionary biologists have <a href=\"https:\/\/www.scientificamerican.com\/article\/the-surprising-origins-of-evolutionary-complexity\/\" target=\"_blank\" rel=\"noreferrer noopener\">theorized that evolution has a natural tendency to produce greater complexity, even without natural selection<\/a>. They make their argument mathematically: Mutation is random, and randomness increases complexity. Therefore, mutation trends toward complexity.<br><br>For example, imagine a very simple organism that\u2019s made up entirely of one kind of cell. Any mutation at all\u2014whether beneficial, detrimental, or neutral\u2014could result in the organism having at least two kinds of cells, and therefore becoming more complex. The more mutations occur, the greater the cell diversity and subsequent complexity. Thus, evolution inevitably leads to complexity.<br><br>However, this theory remains controversial. Critics argue that organisms are always living under <a href=\"https:\/\/www.shortform.com\/blog\/natural-selection-in-evolution\/\">natural selection<\/a>, and therefore it&#8217;s difficult to prove that this (or any) force is truly independent of natural selection.<\/td><\/tr><\/tbody><\/table><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>How could something as complex as the human brain have evolved from a simpler structure? Does evolution naturally produce complexity? When Charles Darwin published On the Origin of Species, some scientists brought up a challenge to his theory of evolution: Complex features are difficult (if not impossible) to create through small increments as Darwin had suggested. In the last edition of his book, Darwin responded. Keep reading to learn about the evolution of complexity.<\/p>\n","protected":false},"author":9,"featured_media":15321,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[39,160],"tags":[1061],"class_list":["post-105273","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-history","category-science","tag-on-the-origin-of-species","","tg-column-two"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v24.3 (Yoast SEO v24.3) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>The Evolution of Complexity: Charles Darwin Responds to Critics - Shortform Books<\/title>\n<meta name=\"description\" content=\"Complex features are hard if not impossible to create in small increments. 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