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Ch 22: Descent with Modification
Charles Darwin published On the Origin of Species by Means of Natural Selection (November 24, 1859)
Origin of Species- focused biologists? attention on the great diversity of organisms
a. Origins and relationships, similarities and differences, geographic distribution, adaptations to surrounding environments
b. Presented evidence that the many species of organisms presently inhabiting Earth are descendants of ancestral species that were different from the modern species
Invertebrates
sponges, segmented worms, echinoderms, mollusks, and arthropods
They do not have backbones or internal skeletons.?
Some have external skeletons, called exoskeletons
???
Sponges
-Very simple animals that have many pores (holes) through which water flows.
-Water moves into a central cavity and out through a hole in the top.
-obtain their food and eliminate wastes through this passage of water.
-They have specialized cells for obtaining food and oxygen from the water.
???
Cnidarians
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Chapter 5: Perception
October 26, 2013
Pg 152-173
AP Psychology Key Names Review
APUSH 20th Century Exam Review: Presidents
APUSH 20th Century Exam Review: Foreign Policy
APUSH 20th Century Exam Review: Literature
Pages
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