Characteristics of Animals
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| Animals consume this way: | Heterotrophic | |
| Specialized cells and tissues develop from: | Embryonic germ layers | |
| 2 cell tyes unique to animals: | Nervous and muscle | |
| Animals reproduce this way: | Sexual | |
| What stage dominates life cycle? | Diploid | |
| As an embryo develops, new cells are formed and different types of cells develop by the processes of: | cell division and differentation | |
| What are Hox genes? | “master genes” that control expression of many other cells | |
| What event marked the first fossil appearance of living animals? | Cambrian explosion | |
| 3 types of symmetry in animals: | assymetrical, bilateral, and radial | |
| Cephalization is linked to: | symmetry | |
| What is a tissue? | collection of specialized cells enclosed in membranes | |
| What is significant about primordal tissues? | They give rise to all other tissues and organs | |
| What does the ectoderm develop into? | skin, brain, and nervous tissue | |
| What does the mesoderm develop into? | muscles, bones, blood, skin, and reproductive organs | |
| What does the endoderm develop into? | digestion and respiration structures | |
| What does triploblastic mean? | 3 germ layers(endoderm, mesoderm, and ectoderm) | |
| What does diploblastic mean? | 2 germ layers (endoderm and ectoderm) | |
| What is a body cavity used for? | internal space for organs, organs move and grow independent of body wall, and could be hydrostatic skeleton if there is fluid | |
| What are 3 classifications based on body cavity? | Coelomate (true cavity completely lined with mesoderm tissue), Pseudocoelom (cavity not completely lined), Acoelomate (no cavity, mesoderm-filled region) | |
| Differences in development are based on what 3 criteria? | cleavage patterns, coelom formation, and blastopore fate |
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