what is an animal? biology post falls hs. characteristics heterotroph movement (and sessile) energy...
TRANSCRIPT
What Is an Animal?
Biology
Post Falls HS
Characteristics
• Heterotroph
• Movement (and sessile)
• Energy from nutrients
• Eukaryotic with adaptations
Development of Animals• Fertilization of haploid gametes to form
zygote
• Blastula forms (hollow sphere)
• Gastrula forms (indents to give 2 layers)
• Ectoderm and endoderm
• Ectoderm forms skin and nerves
• Endoderm forms digestive lining
• Mesoderm forms later into muscles, reproductive and circulatory
Development (cont)
• Gastrula opening becomes mouth in protostomes
• Gastrula opening becomes anus in deuterostomes
• Some develop larval forms before adult
• Birth occurs after development reaches a satisfactory stage
• Viviparous, oviparous, ovoviviparous
Symmetry
• Balance in proportions of an organism
• General body plan or layout
• Asymmetry, radial symmetry, bilateral symmetry
Asymmetry
• Sponge• Irregular• No consistent design
Radial Symmetry
• Hydra, sand dollar• Central area with
parts radiating outwardly like spokes of a wheel
• Can be divided along any plane along its axis into relatively equal halves
Bilateral Symmetry
• Humans• Can be divided down
its length into mirror image halves
• Anterior, posterior, dorsal, ventral
• More muscular control so more efficient food gatherers
Bilateral Symmetry
Body Plans of Bilats
• Coelom – true body cavity that develops from the fluid-filled cavity inside the mesoderm
• Acoelomate, pseudocoelomate, coelomate
• Examples
Protection and Support• Exoskeleton• Endoskeleton
Protection and Support
• Vertebrate• Invertebrate