Answer:
The first attempts at domestication of animals and plants apparently were made in the Old World during the Mesolithic Period. Dogs were first domesticated in Central Asia by at least 15,000 years ago by people who engaged in hunting and gathering wild edible plants
Explanation:
This might help,the presence of hydrochloric acid creates an acidic environment within the stomach that is needed to convert pepsinogen to pepsin. Mucus that is produced by the epithelial cells of the stomach help protect the lining of the stomach from the corrosive hydrochloric acid and pepsin.
The answer is C. Schizoaffective Disorder
Schizoaffective disorder is a combination of symptoms of schizophrenia and mood disorders, such as depression . . . . cycles of severe symptoms are often followed by periods of improvement . . . . symptoms may include delusions, hallucinations, depressed episodes . . . " (Source Mayo Clinic)
there would be no ecosystem
A physical change occur when objects or substances undergo a change that does not change in which the composition of a substance changes or one or more substances combine or break up from new substances.
