Answer:
Physical adaptations do not develop during an individual animal's life, but over many generations. The shape of a bird's beak, the color of a mammal's fur, the thickness or thinness of the fur, the shape of the nose or ears are all examples of physical adaptations which help different animals survive.
Glacier because ice sheet and stuff and science ill explain more in the comments
Without backbone or having no backbone is considered as INVERTEBRATES.
hope its help...
--kcirejay:♥)
