Answer:
4. A test group where the variable is not changed or applied
Explanation:
Because, biscuit biscuit biscuit nom nom
Portugal based its claim to Brazil on the fact that Pedro Alvarez Cabral had landed and had been the first European to discover Brazil in 1500.
Pedro Alvarez Cabral was a Portuguese nobleman, navigator, and also a military commander.
Economics focuses more on interactions/marketing/ those type of focus
