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You say "were" (past tense), which implies that mammals existed before be no longer do. Mammals still live all over the world. In fact, we humans are mammals.
If you are looking for ways in which other (non-human) animals are useful to humans, some possibilities are:
1. We use cattle and pigs for meat.
2. We keep dogs and cats as companions.
3. We can ride on the backs of horses and camels.
4. We can hitch oxen to wagons and get them to pull.
5. We can go to the zoo and be entertained by monkeys.
What else can I help you with?
What kind of parents do mammals make?
Mammals are good and helpful parents.
What is a good intro sentence about mammals?
Mammals are creatures that can feed their young with their own milk.
What animals are not good for producing fossils?
mammals
Why are some mammals hunted?
They are fat and taste good :)
Why do mammals have good eyesight?
Most reptiles use heat sensors to detect prey. But, most mammals have good eyesight because they don't have heat sensors. They use only their eyes.
Why is producing milk important to mammals?
It is a good source of nutrients to newborns.
Describe the characteristics of mammals?
They live on land, can't hold for too long under water except for some animals.
Why do mammals eat chocolates?
Humans are the only mammals who (should) eat chocolates. They do so because they tatse good and are common for gift-giving, sweet indulgences, and celebrations.
What good and bad things do insects do?
birds eat them and fish and reptiles and some mammals
Does an elephant have good behavior?
As is the case with most of the more advanced mammals, an elephant can have good behavior or bad behavior, depending on where it is and how it is treated.
Who can swim better horse or human?
Marine mammals. Dogs are also very good swimmers.
What allowed mammals to spread and dominate duringr this era?
Natural selection and really good traits.
