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

The serengeti plains are part of the african savanna ecosystem and are home to a variety of different species of plants and animals. the serengeti plains experience a seven-month period of seasonal drought each year, during which the ecosystem receives only four inches of rain and the availability of some resources becomes very scarce. which type of limiting factors does the seasonal drought in the serengeti plains affect?