Theory of Evolution: Darwin vs. Lamarck. Texas Horned Lizard Defense Behavior Adaptations -Its horns are extensions of its cranium and contain true bone.

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Theory of Evolution: Darwin vs. Lamarck

Texas Horned Lizard Defense Behavior Adaptations -Its horns are extensions of its cranium and contain true bone. -When threatened it will puff up its body to cause its spiny scales to protrude, which makes it hard to swallow. -Has the ability to squirt an aimed stream of blood from the corners of it’s eyes and sometimes mouth for a distance up to 5 feet.

Objective Students will be able to identify three scenarios of Darwin and Lamarck’s theory of evolution on a worksheet provided in class. Venn Diagram Different Same

Who is Darwin and Lamarck? Charles Darwin Feb April 1882 English Naturalist. Published his theory of evolution in his book On the Origin of Species. Remembered for his theory of evolution called natural selection. Jean-Baptiste Lamarck Aug Dec French Naturalist. Provided the first truly cohesive theory of evolution. Remembered for his use/disuse theory of evolution.

Darwin’s Theory of Evolution Organisms that have variation will adapt to their environment and have more offspring. Offspring are born with their parents’ favorable traits and as they reproduce those traits become more dominant. Inheritance Variation

Lamarck’s Theory of Evolution Changes in an organism are influenced by what the organism wants or needs and then over many generations the offspring are born with these changes. Individual structures (body parts) of an organism decreases in size by disuse and increases in size when used. Wants and Needs Use and Disuse

Darwin and Lamarck agreed that… Organisms change to work better in their environment. Organisms have evolved (changed) over time and are still evolving.