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Class Clips

Secondary Science : Bio: Evolution - Theories

Clip description		Keywords
	Evolution of the animal eye Duration: 2:30 Darwin had difficulty with his Theory of Evolution when considering the origin of the eye. A description of the evolution of different eye types in animal species.	Darwin, eye, animal, natural, evolution, snail, eagle, slug, conch, earthworm, vision, lens, refraction, light, sensitive, cell

	Mass extinction in numbers Duration: 02:00 A brief history of extinction on planet Earth.	DaraOBriainsScienceClub, Science club, geology, palaeontology, extinction, mass extinction, dinosaur

	Natural selection and survival of the fittest Duration: 2:01 What did Darwin mean by the terms 'natural selection' or 'survival of the fittest'? Darwin's description is illustrated by the hunting of a gazelle by a cheetah.	Darwin, cheetah, gazelle, natural selection, survival of the fittest, David Attenborough, predator, prey, advantage, species, variation

	Population size and control - predators and prey Duration: 1:26 In the absence of predators, what happens to the size of a prey population? Mice can reproduce in large numbers without population control.	Darwin, mice, predator, prey, population, food, chain, Australia, outbreak, offspring, survive

	Sexual selection Duration: 2:30 How did peacocks and stag beetles evolve characteristics to increase their chances of mating? Darwin suggested they evolved by sexual selection.	Darwin, peacock, stag, beetle, evolution, mating, reproduction, sex, selection, competition, mate, tail, jaws, predator

	The story of extinction and the age of the Earth Duration: 04:34 An animated history of our understanding of extinction and the age of the earth.	DaraOBriainsScienceClub, Science club, Geology, Palaeontology, extinction, mass extinction, deep time, geological time, fossil, radioactive dating

	Thomas Fairchild, speciation and evolution Duration: 06:43 Thomas Fairchild was the first to artificially cross two plant species and produce a 'new' plant.	plant, biology, species, cross-breeding, Darwin, Thomas Fairchild, botany

	Variation and inheritance Duration: 02:05 What did Darwin think about variation within species? An excerpt from 'On the Origin of Species' describing butterfly variation as an example of species in the process of formation.	Darwin, butterflies, variation, inheritance, theory, species, origin, wild, natural, god

LEARNING ZONE BROADBAND

Secondary Science : Bio: Evolution - Theories

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