Question

multiple choice question
what vertebrates have hair and nourish their young with the mothers milk?
amphibians
arachnids
mammals
nonavian reptiles

Explanation:

Mammals are vertebrates that have hair and nourish their young with the mother's milk. Amphibians are cold - blooded vertebrates that typically have a life cycle involving water and land but do not have hair or nurse their young with milk. Arachnids are invertebrates (not vertebrates). Non - avian reptiles are vertebrates but are cold - blooded, do not have hair in the typical mammalian sense, and do not nurse their young with milk.

Answer:

mammals