23.10. Gallery: Paleozoic erahttps://peda.net/id/37f3b2f23542020-12-03T11:23:33+02:00https://peda.net/:static/539/peda.net.logo.bg.svg<div class="license">Tämän sivun lisenssi <a rel="license" href="https://peda.net/info">Peda.net-yleislisenssi</a></div>
The earliest fish had no jaws. The lamprey (pictured) is the only modern fish species that retains this characteristic.https://peda.net/id/37f455c33542020-12-03T11:23:33+02:00<a href="https://peda.net/oppimateriaalit/e-oppi/verkkokauppa/yl%C3%A4koulu/lukuvuosi-20-21/englannin-kieliset/biology/e9i22/evoluutio_perusteet/g11eva2a/aolnvnkolnaoomjn5mvs#top" title="shutterstock_94254277_nahkiainen_p.jpg"><img src="https://peda.net/oppimateriaalit/e-oppi/verkkokauppa/yl%C3%A4koulu/lukuvuosi-20-21/englannin-kieliset/biology/e9i22/evoluutio_perusteet/g11eva2a/aolnvnkolnaoomjn5mvs:file/thumbnail/97e449a2a759ba5af5aac19ca4ec10ce7a70f2d9/shutterstock_94254277_nahkiainen_p.jpg" alt="" title="The earliest fish had no jaws. The lamprey (pictured) is the only modern fish species that retains this characteristic." class="thumbnail" loading="lazy"/></a>2020-12-03T11:23:33+02:00The development of jaws rendered effective predation possible. The skeletons of cartilagenous fish, such as sharks, consist of cartilage. The picture shows a great white shark.https://peda.net/id/37f4acd63542020-12-03T11:23:33+02:00<a href="https://peda.net/oppimateriaalit/e-oppi/verkkokauppa/yl%C3%A4koulu/lukuvuosi-20-21/englannin-kieliset/biology/e9i22/evoluutio_perusteet/g11eva2a/lkmtsrkhtkrlskv2#top" title="valkohai_shutterstock_76001860_peda_p.jpg"><img src="https://peda.net/oppimateriaalit/e-oppi/verkkokauppa/yl%C3%A4koulu/lukuvuosi-20-21/englannin-kieliset/biology/e9i22/evoluutio_perusteet/g11eva2a/lkmtsrkhtkrlskv2:file/thumbnail/76eb3a7f9d76f79328f8f36e824dceecd6e612c6/valkohai_shutterstock_76001860_peda_p.jpg" alt="" title="The development of jaws rendered effective predation possible. The skeletons of cartilagenous fish, such as sharks, consist of cartilage. The picture shows a great white shark." class="thumbnail" loading="lazy"/></a>2020-12-03T11:23:33+02:00The horseshoe crab has retained a similar form for millions of years. Such species are often called "living fossils".https://peda.net/id/37f508e63542020-12-03T11:23:33+02:00<a href="https://peda.net/oppimateriaalit/e-oppi/verkkokauppa/yl%C3%A4koulu/lukuvuosi-20-21/englannin-kieliset/biology/e9i22/evoluutio_perusteet/g11eva2a/moonkmvassvsef#top" title="ayriaiset_molukkirapu_sveistola_eoppi_1383_peda_p.jpg"><img src="https://peda.net/oppimateriaalit/e-oppi/verkkokauppa/yl%C3%A4koulu/lukuvuosi-20-21/englannin-kieliset/biology/e9i22/evoluutio_perusteet/g11eva2a/moonkmvassvsef:file/thumbnail/fa7c533647faa7023af4bc8d5718846a2ee7e8cf/ayriaiset_molukkirapu_sveistola_eoppi_1383_peda_p.jpg" alt="" title="The horseshoe crab has retained a similar form for millions of years. Such species are often called "living fossils"." class="thumbnail" loading="lazy"/></a>2020-12-03T11:23:33+02:00Toads are amphibians. They are land-dwelling animals that are still dependent on water for reproduction.https://peda.net/id/37f55dc93542020-12-03T11:23:33+02:00<a href="https://peda.net/oppimateriaalit/e-oppi/verkkokauppa/yl%C3%A4koulu/lukuvuosi-20-21/englannin-kieliset/biology/e9i22/evoluutio_perusteet/g11eva2a/rksnorvjnpok#top" title="rupikonna_oharma_eoppi_1412_peda_p.jpg"><img src="https://peda.net/oppimateriaalit/e-oppi/verkkokauppa/yl%C3%A4koulu/lukuvuosi-20-21/englannin-kieliset/biology/e9i22/evoluutio_perusteet/g11eva2a/rksnorvjnpok:file/thumbnail/71905e1dedc2dc89da3f3bbf27b7256ae4cac845/rupikonna_oharma_eoppi_1412_peda_p.jpg" alt="" title="Toads are amphibians. They are land-dwelling animals that are still dependent on water for reproduction." class="thumbnail" loading="lazy"/></a>2020-12-03T11:23:33+02:00Scorpions are an ancient group of organisms. They existed already 400 million years ago. Modern scorpions resemble their fossil predecessors.https://peda.net/id/37f5b9783542020-12-03T11:23:33+02:00<a href="https://peda.net/oppimateriaalit/e-oppi/verkkokauppa/yl%C3%A4koulu/lukuvuosi-20-21/englannin-kieliset/biology/e9i22/evoluutio_perusteet/g11eva2a/sovenojy4mvsnsmfe#top" title="hamahakkielaimet_skorpioni_shutterstock_82483516_peda_p.jpg"><img src="https://peda.net/oppimateriaalit/e-oppi/verkkokauppa/yl%C3%A4koulu/lukuvuosi-20-21/englannin-kieliset/biology/e9i22/evoluutio_perusteet/g11eva2a/sovenojy4mvsnsmfe:file/thumbnail/0b08ad79a6a811ac811ebdd16131862248446fa8/hamahakkielaimet_skorpioni_shutterstock_82483516_peda_p.jpg" alt="" title="Scorpions are an ancient group of organisms. They existed already 400 million years ago. Modern scorpions resemble their fossil predecessors." class="thumbnail" loading="lazy"/></a>2020-12-03T11:23:33+02:00Dragonflies have existed on Earth for over 300 million years. They are among the oldest insects in the world.https://peda.net/id/37f619413542020-12-03T11:23:33+02:00<a href="https://peda.net/oppimateriaalit/e-oppi/verkkokauppa/yl%C3%A4koulu/lukuvuosi-20-21/englannin-kieliset/biology/e9i22/evoluutio_perusteet/g11eva2a/soomj3mvnomvh#top" title="ruskohukankorento_oharma_eoppi_1385_peda_p.jpg"><img src="https://peda.net/oppimateriaalit/e-oppi/verkkokauppa/yl%C3%A4koulu/lukuvuosi-20-21/englannin-kieliset/biology/e9i22/evoluutio_perusteet/g11eva2a/soomj3mvnomvh:file/thumbnail/3e6ca954398214f3069d93e908d41be0834a5221/ruskohukankorento_oharma_eoppi_1385_peda_p.jpg" alt="" title="Dragonflies have existed on Earth for over 300 million years. They are among the oldest insects in the world." class="thumbnail" loading="lazy"/></a>2020-12-03T11:23:33+02:00Horsetails are spore-bearing plants.https://peda.net/id/37f66cd03542020-12-03T11:23:33+02:00<a href="https://peda.net/oppimateriaalit/e-oppi/verkkokauppa/yl%C3%A4koulu/lukuvuosi-20-21/englannin-kieliset/biology/e9i22/evoluutio_perusteet/g11eva2a/kks#top" title="peltokorte_oharma_eoppi_1411_peda.jpg"><img src="https://peda.net/oppimateriaalit/e-oppi/verkkokauppa/yl%C3%A4koulu/lukuvuosi-20-21/englannin-kieliset/biology/e9i22/evoluutio_perusteet/g11eva2a/kks:file/thumbnail/d4ce9ea1ba0b236614ec34b5420642e40374033e/peltokorte_oharma_eoppi_1411_peda.jpg" alt="" title="Horsetails are spore-bearing plants." class="thumbnail" loading="lazy"/></a>2020-12-03T11:23:33+02:00The common polypody is a type of fern that likes to grow on rocky surfaces. Unlike most ferns, it is resistant to drought.https://peda.net/id/37f6c2993542020-12-03T11:23:33+02:00<a href="https://peda.net/oppimateriaalit/e-oppi/verkkokauppa/yl%C3%A4koulu/lukuvuosi-20-21/englannin-kieliset/biology/e9i22/evoluutio_perusteet/g11eva2a/kosjkkjmktkmsskhk#top" title="kasvit_saniaiset_kallioimarre_oharma_eoppi_1377_peda_p.jpg"><img src="https://peda.net/oppimateriaalit/e-oppi/verkkokauppa/yl%C3%A4koulu/lukuvuosi-20-21/englannin-kieliset/biology/e9i22/evoluutio_perusteet/g11eva2a/kosjkkjmktkmsskhk:file/thumbnail/446532eebff29938a25ec9e702573fdfb3b721d1/kasvit_saniaiset_kallioimarre_oharma_eoppi_1377_peda_p.jpg" alt="" title="The common polypody is a type of fern that likes to grow on rocky surfaces. Unlike most ferns, it is resistant to drought." class="thumbnail" loading="lazy"/></a>2020-12-03T11:23:33+02:00