A person who researches cures for diseases is called a biomedical researcher or a medical researcher.
A Medical researcher.
A person qualified to treat diseased or injured animals is an VET-ER-I-NAR-I-ANVETERINARIAN
A person who studies animals is called a zoologist.
A person that assists in handling animals can be called a groom if they work with horses. A person who works with zoo animals might be called a trainer, zookeeper, or handler. A person who raises animals for food might be called a rancher or dairy farmer.
A person who shows animals to people and educates them about the animals is typically called a zookeeper, wildlife educator, or animal handler.
Animals help by making people happy. And some derived animals are used for medicines and cures.
zookeeper
zookeeper
A Veteranarian
A person who studies animals and the way they interact with their environment is called an ecologist or a wildlife biologist.
A person who studies animals is called a zoologist.