complete metamorphosis
The archenteron, which develops into the digestive system of an animal, is formed during gastrulation, the process by which the cells of a blastula are partitioned into three separate germ layers.
animals become crazy due to rabies and due to some changes in the brain.
Yes that is possible, it has happened twice to me!
Most become extinct because they can not adapt to changes in their environments. Those that can don't become extinct.
Through evolution, loss of natural habitat and environmental changes.
They can grow larger, since invertebrate animals can't become bigger than some size, since their structure doesn't hold their weight after that limit without a bone structure. Vertebrate animals can also move faster.
The state constitution
you must be stupid. adapt is to become comfortable with something. anyone can adapt, animals, humans, anything. adapting to changes...etc
Animals will adapt, as they always have. The fact of the matter is that Earth has been warmer in the past than it is now. The temperature of this planet is not static...it changes on a fairly regular basis. Animals (including humans) will either adapt to the changes or become extinct.
The epithelial lining changes from pseudostratified ciliated columnar to cuboidal and simple squamous.
Continental rifting will cause plants and animals to evolve due to their changing habitats. Plants and animals that become isolated will begin to diverge and change to fit into their new ecosystems.
If we keep on harming the enviornment, then yes, some animal species could become threatened, endangered, or maybe even extinct!