From what I have learned about stingrays... They don't exactly "sleep" But they do go in a state of awareness when they "sleep" They sleep anytime they want (its not like they can tell time lol)
Answer:
Innovative curriculum design
Explanation:
Hope it helps!
Answer:
This is an example of an experimental design.
Explanation:
Experimental design in research involves controlling the variables in order to prove the hypothesis. In an experimental design there must be an experimental group, that in this case is the group that received an herbal supplement, and a control group, that was only administered placebo. By having a control group, both groups can be measured and compared at the end of the experimental phase, to measure the influence of the independent variable.
Then he would know when they were under attack and he could let everybody know.
