A researcher wants to know whether eating chocolate makes people nervous. Some participants are given two bars of chocolate to eat, and some are given no chocolate at all, and then all of the participants are tested for nervousness an hour later. In this experiment, the participants who eat the chocolate are in the group, while the people who did not eat any chocolate are in the group.

The correct answer is - test group and control group respectively.

Explanation:

In any study or research, the experimental or test group is the group that gets the treatment or experience the manipulation of the independent variable change. In the given case, the experimental group is the group of people or participants who eat the chocolate.

The control group is the group of subjects who did not receive any treatment in the research to analyze the test results of the experimental groups, in this particular case who did not eat any chocolates is in the control group.

the first one is d and the second a

spain, portugal, france and england.

explanation:

spain, portugal, france and england were the first european country to carve an empire in the americas.

you gave no answer choices so, i gave you all of the correct countries.