Hi, can you please answer this question with explanation?
Worth 20 points ! Please help! ASAP

For those who need theses answers i just took the test and got everyone of them

Ln finding the density of liquid why is the method of using a density bottle more accurate than the one of using a measuring cylinder

According to piaget’s stages of cognitive development, the child does not differentiate between self and other objects. the child repeats rewarding activities, discovers new ways to get what he or she wants, and may have imaginary friends. which period is described?