What effect of the columbian exchange does this image illustrate?

Which of the following terms is defined as supported by scientific research l and knowledge of how children and develop? a. evidence-based practices b. ethical conduct c. advocacy d. culture competence

The homestead act made it possible for millions of people to achieve the dream of acquiring immense wealth. owning a farm. living in a brick house. moving to a big city.

Can someone explain and give me two examples of checks and balances in usa government right three examples