Flashcards in Lecture 29 - History of Animal Life on Earth Deck (23):
What domain are animals in?
Are animals multi or uni cellular?
What are animals held together by?
Do animals have cell walls?
How do animals reproduce?
Which stage is the dominating stage of the lifecycle in animals?
What are the 5 basic stages of sexual reproduction/
What specialized genes do animals have?
What are the 5 characteristics of an animal?
1. Multicellular, heterotrophic eukaroytes
2. Lack cell walls of plants + fungi
3. Two unique tissues: nerves + muscles
4. Sexual reproduction, diploid adult stage
5. Have homeotic (Hox) genes regulating early development
What are larva?
-morphologically/ecologically distinct from adult
Larvae eventually undergo __________
What are the 2 types of symmetry?
1. Radial (diplobaslatic)
2. Bilateral (tripoblastic)
What are the 3 germ layers?
3. mesoderm (only in tripblastic)
What are 2 types of development?
1. protosome (spiral)
-blastopore becomes mouth
-blastopore becomes anus
What is the common ancestor for all animals?
What are the 3 types of body cavites?
1. coelomates (true cavity derived from mesoderm)
2. pseudocoelomates (derived from mesoderm + endoderm)
What may have been the first vertebrates to leave water?
What are the 4 major Eras?
What was the neoproterozic era?
-First evidence of early animal embryos + predation
What was the main feature of the paleozoic era?
-earliest fossil appearance of many major groups of living animals
What are 3 reasons for the Cambrian explosion?
1. hox genes
What are 3 defining features of the mesozoic era?
1. Coral reefs
2. Dinosaurs were dominant terrestrial vertebrates
3. First mammals emerged, flowers/insects diversified