What are idea models designed to do? what is one drawback of using idea models?

Covalent bonds are formed between metals and boiling points true or false

Which are forms of nitrogen that are usable by humans

Many kangaroo rats live in the sonoran desert of the southwestern united states. they have a variety of adaptations for living in the desert. under which circumstance would the kangaroo rats of the sonoran desert be most likely to develop new adaptations by natural selection?