The entire region of east asia is heavily influenced by a. china b. japan c. taiwan d. south korea

A. China

Explanation:

By throwing flowers in the way of its neighbors, China and the history of its empire influenced many of the Asian countries.

Culturally and linguistically, ancient Chinese - with its monosyllabic and tonal language and its very special characters - is the genesis of many alphabets and languages of Southeast and East Asia.

this null effect is caused by a weak manipulation and ineffective internal validity. in a scientific study, as the one dr. morimoto is trying to perfom, internal validity refers to the confidence placed in the cause-effect relationship and to how well an experiment is done and able to eliminate confounding variables.