BIO SCI 94 Chapter Notes - Chapter 33: Comparative Genomics, Animal Locomotion, Meiosis

• School: UC-Irvine
• Department: Biological Sciences
• Course: BIO SCI 94
• Professor: Robin Bush

Document Summary

Animals are eukaryotes that share key traits: All animals are multicellular, with cells that lack cell walls but have an extensive extracellular matrix, with proteins specialized for cell-cell adhesion and communication. All animals are heterotrophs, most ingesting than absorbing. All animals move under their own power at some point in life cycle. All animals other than sponges have neurons and muscle cells. Muscles are adaptations for large organism to move efficiently. Animals are the only multicellular heterotrophs on the tree of life that usually ingest their food first, before they digest it. The combination of multicellularity, heterotrophy, and efficient movement makes animals the largest predators, herbivores, and detritivores on earth. 33. 2 what key innovations occurred during the evolution of animals. Biologists study evolution of animals with three types of data. Fossils - important bc provide the only direct evidence of what ancient animals looked like when they existed and where they lived.