chapter 1 – 3
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Chapter 1 – 3. Interactions Among Living things. Natural Selection is that process by which, over time, living things become better suited to their environments. This was first suggested by Charles Darwn in 1859. - PowerPoint PPT PresentationTRANSCRIPT
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Chapter 1 – 3Interactions Among Living things
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Natural Selection is that process by which, over time, living things become better suited to their
environments. This was first suggested by Charles Darwn in 1859
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Darwin suggested that through reproduction, natural selection encourages organisms to change and adapt
to their environments. Successful evolutionary adaptations ensure the survival of a species.
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In a famous 1860 court debate with Bishop Samuel Wilberforce, English Biologist Thomas H. Huxley defended evolution:
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His opponents enjoyed it when Bishop “Soapy Sam” Wilberforce asked him, “Are you descended from an ape, Mr. Huxley, from
your mother’s or your father’s side?” Huxley’s reply put Wilberforce’s “science” into perspective. If such a question were to be put to me, Huxley replied, “would I rather have a miserable
ape for a grandfather or a man highly endowed by nature and possessed of great influence and yet who employs these
faculties and that influence for the mere purpose of introducing ridicule into a grave scientific discussion, I unhesitatingly affirm
my preference for the ape.”
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The role of an organism in its habitat is called its niche. That is, all the actions including feeding, reproduction, living patterns and
locations are considered parts of an organism’s niche.
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Three types of interactions occur among organisms. *Competition
*Predation*Symbosis
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All organisms COMPETE for survival!
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Competition is the struggle between organisms to survive as they attempt to use the same limited resources.
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Predation is interaction in which one organism kills another for food.
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Predator/Prey Adaptations include:Speed, Eyesight
False ColoringCamouflage
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Symbiosis is a relationship between two species that benefits at least one. Three types of
Symbiosis include:
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Mutualism – Both Species Benefit!Yellow-billed Oxpecker & HippoStinging Ants and Acacia Tree
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Commensalism – One species benefits and other is unharmed. Not common in nature.
Red-Tailed Hawk & Saguaro Cactus
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Parasitism – Parasite benefits and host is harmed.Fleas, Ticks, Leeches, Worms, Mites, Chiggers
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If time, Jumping Asian Carp!