Please help! i mark you brainless please thank you ​

Why is the united states a constitutional republic? why is china, which has a constitution, not one? compare the forms of government in the united states and china.

What is the natural environment? the story of the interaction of people forming societies, cultures, and civilizationsan increase in the world’s temperaturethe process by which social institutions are adopted on a global scalethe natural world in which people, plants, and animals live

Arecent challenge to the european union created by a member state is?