Question

Give reason :
1)birds have pneumatic bone.
2)crocodile have four chambered hearts.
3)Platypus lay eggs but are considered as mammals ​

Answer 1

1) Pneumatic Bone Structure. ... The same pockets and air sacs are present in bird bones. Actually, birds don't just have pneumatic bones in their skull, they havethem throughout their skeleton. It is this fact that makes the avian skeleton lightweight and delicate.

2)The crocodile has the most complicated blood circulation of all vertebrates. They dohave four chambers in their heart yes as well as two ventricles which is very unusual in reptiles. Crocodiles adapted to have a heartlike this, because they evolved from smaller reptiles which don't have a four chambered heart.

3)Like mammals, monotremes are warm blooded animals whoce body is covered with fur.They also nourish their young. Echidnaand platypus belong to the order Monotremata of Mammalia.These are onlyegg laying mammals. ... The echidna is found in australia along with platypus lay eggs andproduce milk for its young one.

Answer 2

HEY HERE IS YOUR ANSWER HOPE THIS HELPS MARK AS BRAINLIST.


1.Pneumatic Bone Structure. ... The same pockets and air sacs are present in birdbones. Actually, birds don't just have pneumatic bonesin their skull, they have them throughout their skeleton. It is this fact that makes the avian skeleton lightweight and delicate.

2.
It has a four-chambered heart and two ventricles, an unusual trait among extant reptiles, and both a left and right aorta which are connected by a hole called the Foramen of Panizza. Like birds and mammals, crocodilians have heart valves that direct blood flow in a single direction through the heart chambers.


3.Mammals that lay eggs are called monotremes and include platypusesand echidnas, both of which live in Australia. Like all mammals, monotremes are warm-blooded, covered with fur and nurse their young. Animals are so interesting because they don't always follow the rules.