Building Custodian.
Housekeeper , maid , domestic servant ,
A person who takes care of building a school is typically referred to as a contractor.
a person who rides elephants is called a mahout
Mama is a person that gave birth to you or the person that takes care of you. Some people call mama as a different name like mommy, mother or mum.
Aquarist is someone who has aquariums and cares for fish
A zookeeper is a person that takes care of any animal in a zoo and keeps track of the animals diet and weight. Veterinarians take care of sick animals and gives them medicine
childcarer
traffic trigger
doctors
Farmer or bison rancher.
Life guard
This is a manicurist.
Grounds keepers
The general name for that field is gerontology.
A parent/guardian
A house maker is someone who stays at home and takes care of things there like cooking dinner and cleaning the house.
I would call them an aspiring veterinary nurse or an aspiring veterinary surgeon.
Someone who takes care of animals would be a Veterinarian. It could also be a farmer, or a zoologist. Even an animal trainer.