Kingdom Animalia

• Vertebrates - animals with backbones
• Invertebrates - animals without backbones
• Cell specialization - modification of a cell to perform certain activity
• Oviparous - animals that give birth to their young by laying eggs
• Viviparous - bear their young alive
• Hermaphrodite - an animal that possess both sex organs
• Dioecious - having male and female organ in separate organisms of the same species
• Parthenogenesis - the development of an egg without fertilization