The correct answers on Plato are
excretory system
circulatory system
Oxygen's valence, based on the Number of valence electrons or outermost electrons that oxygen has would be 6.
I Think The answer is b I hope it helps
The advantages and limitations of obtaining informant report data for the courage trait are;
Advantages include;
Large amount of information
Definitional truth based on the observed acts of courage.
Limitations on the other hand include;
Very little behavioral data,
Error; much more likely to remember acts of courage than non-courageous acts.