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.
This is a manicurist.
Life guard
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.