What is a mammal and what are its distinguishing characteristics?

Answer 1

Mammals are especially known for their mammary glands which females use to produce milk to feed their young.

They all also have hair, a neocortex ("new bark" - like the bark of the tree is the outer part) or outer part of the brain. The cortex is some times called the reptile brain.

Also they have three ear bones (the smallest bones in your body) and a heart that has four chambers.

They range in size from 30mm to 33 meters: the bumblebee bat and the blue whale.

Most give birth to live young except for a few egg laying mammals.

Bumblebee bat

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Answer 2

Sebastian Alvarado

A mammal is a warm-blooded vertebrate animal characterized by the presence of mammary glands, which produce milk to nourish their young. Mammals also have hair or fur, a neocortex region in the brain, and typically give birth to live young (although some lay eggs). Additionally, mammals have a four-chambered heart and breathe air through lungs.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.