Which of these processes is chemical?
Your tongue breaking pieces of a hamburger apart
Chewing a saltine
Peristalsis (muscle movements) occurring in your esophagus to move food into
your stomach
Saliva breaking the saltine down into molecules of glucose

it's diluted or concentrated

in a diluted solution, you can add a lot more solute but in concentrated only a little more can be added

the answer is c.

by: nicholas dooley

the oldest known insects are believed to live around 400 millions ago as suggested by the fossil records.   some plants having woody stems also evolved during this time.

after the evolution of insects the first four legged species or the tetrapods evolved in shallow freshwater habitats from the intermediate species approximately 397 million years ago. the tetrapods went on conquering the land giving rise to amphibians, reptiles, mammals and birds.

the major split in tetrapods first occurred 340 million years ago branching off from amphibians.

363 million years ago when the carboniferous period began the insects started roaming on land and taking flights, following which the four limbed tetrapods adapted in the terrestrial habitat.

not sure what it is