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Why Sharks Are Covered In Teeth
To learn more about this topic, start your googling with these keywords:
Dermal denticles: also called placoid scales, they’re the most primitive form of fish scales that are structurally similar to teeth and are today found only in sharks, rays, and chimaeras.
Outside-in theory: The strongest theory for the evolution of teeth, which are thought to have evolved from dermal denticle scales.
Ostracoderms: Extinct armored jawless fish that lived in the Paleozoic Era
Thelodonts: Extinct jawless fish that had individual scales as opposed to plates of armor
Placoderms: Now extinct, they were some of the first jawed fish and lived from the Silurian through the Devonian era.
MinuteEarth is produced by Neptune Studios LLC
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If you like what we do, you can help us!
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3:48
How A Whale And A Bear Beat The System
To learn more about this topic, start your googling with these keywords:
Megafauna: Large animals, usually over 45 Kgs.
Anthropocene era: A proposed time period delineated the age during which human activity has been the dominant force on the environment and the climate.
Holocene Extinction: An ongoing extinction event of species due to human activity.
Fertility Rate: The number of babies an organism has in its lifetime.
Omnivory: The ability to eat food from two different trophic levels.
Bubble-Net Feeding: A cooperative hunting technique where groups of whales use bubbles to disorient fish prey.
MinuteEarth is produced by Neptune Studios LLC
https://neptunestudios.info
If you like what we do, you can help us!
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3:29
How To Survive Poison
To learn more about this topic, start your googling with these keywords:
Poison: A substance that is capable of causing illness or death when introduced or absorbed.
Overdose: A dangerously large dose of a substance.
Biotransformation: The process by which foreign chemicals are transformed by the body into less toxic substances.
Polydipsia: The medical term for feelings of extreme thirst that can lead to hyponatremia.
Hyponatremia: Abnormally low sodium in the blood often caused by excessive water consumption.
Lethal Concentration - The concentration a substance needs to be in the bloodstream to kill 50% of subjects.
Metabolism - the chemical processes that occur within a living organism in order to maintain life.
Toxicity - the quality of being toxic or poisonous.
Excretion - the process of eliminating or expelling waste matter.
MinuteEarth is produced by Neptune Studios LLC
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2:51
Why These Bears “Waste” Food
To learn more about this topic, start your googling with these keywords:
Foraging: to search widely for food.
Optimal Foraging Theory: A behavioral model that describes how an animal should behave when searching for food.
Surplus Killing: a common behavior exhibited by predators, in which they kill more prey than they can immediately eat and then cache or abandon the remainder.
MinuteEarth is produced by Neptune Studios LLC
https://neptunestudios.info
If you like what we do, you can help us!
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From the creators of the popular science show with millions of YouTube subscribers comes the MinuteEarth podcast. Every episode of the show dives deep into a science question you might not even know you had - but once you hear the answer, you’ll want to share it with everyone you know. Our team of scientists digs into the research and breaks it down into a short, entertaining explanation jam-packed with science facts and terrible puns. We’ll tell the incredible story of how monkeys crossed the Atlantic ocean on natural rafts, and we’ll explain why it gets hotter the deeper you dig underground.
New Zealand