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  1. Backbone
  2. Hair
  3. Young alive
  4. Nurse the young
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Related Questions

What are the four main elements in the ocean?

Fish, rocks , Mammals such as whales ,and crabs.


If an animal does not have four legs can it be a mammal?

Not all mammals have four legs. Bats are mammals, but have only two "legs." Whales and dolphins are mammals, but have no legs at all. What distinguishes mammals from other animals is not the number of legs, but the presence of sweat and milk glands.


Is there a fish that are mammals?

No fish are mammals. Mammals are vertebrate animals that nurse their young. Mammals have many characteristics in common such as being warm-blooded, having some hair or fur, and being tetrapods (having four limbs, although in marine mammals these are fins).


How many eggs do whales have?

Whales do not lay eggs, they give birth to live young.


What are four characteristics that can be used to classify a rock?

Density, crystallography, mineralogy, method of formation, chemistry, texture, hardness, and others.


What mammals are in the family of whales?

Whales looks like fishes. They can swim in water like them but they are not fish as they respire with lugs, have four chambered heart, diaphragm, mammary gland, hairs, etc. Whales are viviparous like any other mammal.


Are whales fish?

No. Whales must to breathe air - they do not have gills and can not breathe underwater. Also, they are mammals, giving birth to live off-spring and suckling them.An easy way to distinguish most marine mammals from fish is the angle of the tail - mammals have it horizontal and fish (including sharks) have a vertical tail fin.No, whales are mammals, like dolphins. An easy way to tell is if something swims with it's tail moving side to side, it is a fish. If the tail moves up and down, it is a mammal. A whale is a mammal, it gives birth to live young and has to rise to the surface to breathe. its whale and no whales are mammals


What are the mammals with 4 legs?

All mammals have four legs, or at least four limbs if they're bipedal such as us, or in the case of bats. Whales have vestigial hind legs, in the form of a pelvis hidden halfway down their tail, and the flippers are their front legs. In fact, all land vertebrates (amphibians, reptiles, mammals, birds) have four limbs. ^^


What characteristics help you classify a quadrilateral as a parallelogram and not a triangle?

Triangles have only three sides; all quadrilaterals, including parallelograms, have four.


What are four factors used to classify soil?

what are four main soils used to classify soils


Do all mammals possess four legs?

Oh, dude, not all mammals have four legs. Like, have you seen a kangaroo? They hop around on two legs and use their jacked-up tail for balance. And let's not forget about those sneaky dolphins, they're mammals too, but they're all about that aquatic life and don't bother with legs at all. So yeah, not all mammals are rocking the four-leg look.


What characteristics is common in all vertebrates?

There are many such features, including: 1. Mammals nourish their young with milk. 2. Mammals are warm-blooded. 3. Mammals have fur. 4. Mammals have a four-chambered heart. 5. Mammals are amniotes. 6. Mammals breathe oxygen. 7. Mammals have three middle ear bones and a neocortex. 8. Mammals have internal reproduction. Some of these characteristics are unique to mammals; others are found in some other vertebrates but not in all other vertebrates.