Consider again the following relational database for theGreenZoo Case. Each animal has unique number and each enclosure hasa unique enclosure number. An animal can live in only oneenclosure. An enclosure can have several animals in it or it can becurrently empty. A zookeeper has a unique employee number. Somezookeeper supervises other zookeepers. Every animal has been caredfor by at least one and generally many zookeepers; each zookeeperhas cared for at least one and g3enrally many animals. Each time azookeeper performs a specific, significant service for an animalthe service type, date and time are recorded. A zookeeper mayperform a particular service
OR
OR