B. i asked my mom shes a surgeon
A. Personal safety, pollution, and extreme temperatures
Answer:
Questionnaires
Explanation:
They allow both government and outside researchers to obtain estimates of a variety of health related topic or issue among either the entire nation or specific demographic group of the population.
And the survey design is cross section.
Fighting diseases, transporting hormones, regulating body temp, removing carbon dioxide, and supplying oxygen to the whole body, removing wastes and removing wastes.