Pretty sure it's basically saying to answer it for yourself and 3 other people. So for the tongue roll, on self, if you can roll your tongue say yes, for subject 1, ask another person, if they can say yes, if subject 2 (another person) can't, say no, and so on.
In this virtual lab, grow two species of paremecium in test tubes and record data on their population growth. Experiment shows that when grown together, one species will die, illustrating the competitive exclusion principle.
Answer:
Whether the stain comes out or not.
Explanation:
What ^ he/she said! Hope you have a good day :)