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Answers
(A)1.streamlined body helps it to cut through the ocean currents
2.gills to respire
3.swim bladder to swim
4.tail fins to change the direction
5.fins to move swiftly
6.skin with scales to let water run over the body easily when swimming
(B)Mammals and birds are warm-blooded, which means that they can make their own body heat even when it is cold outside. Whether it is sunny and hot outside or there is a snowstorm and it is very cold, warm-blooded animals have body temperatures that usually stay the same.
(C)lightweight, smooth feathers – this reduces the forces of weight and drag
a beak, instead of heavy, bony jaws and teeth – this reduces the force of weight
an enlarged breastbone called a sternum for flight muscle attachment – this helps with the force of thrust
light bones – a bird’s bones are basically hollow with air sacs and thin, tiny cross pieces to make bones stronger – this reduces the force of weight
a rigid skeleton to provide firm attachments for powerful flight muscles – this helps with the force of thrust
a streamlined body – this helps reduce the force of drag
wings – these enable the force of lift.
Adaptations for Water. Many structures in fish are adaptations for their aquatic lifestyle. ... Fish have gills that allow them to “breathe” oxygen in water. Water enters the mouth, passes over the gills, and exits the body through a special opening.
