What do we call the improved performance on simple or well-learned tasks in the presence of others?

Which was an effect of the nuclear disaster at chernobyl, ukraine? people and animals did not get sick. drinking water was unsafe for a long time. forests got healthier than they had been. all the nuclear power plants in the world were closed.

Why did many members of congress oppose president lincoln’s plan for reconstruction? a. they believed that freed blacks had gained too much power. b. they thought that the plan was too harsh on confederate sympathizers in the north. c. they thought that the president had overstepped his powers.

Which situation is most likely to show a constant rate of change?