Five-year-old Tammy mistakenly believes that her short, wide glass contains less soda than her brother's tall, narrow glass. Actually, both glasses contain the same amount of soda. This illustrates that Tammy lacks the concept of.

A)conservation.
B)egocentrism. C
)assimilation.
D)object permanence.
E)accommodation.

Dr. redbull conducts a study to determine whether her new energy drink children perform better on spelling tests. she randomly assigns children to one of two groups: group 1 receives her energy drink and group 2 receives water. she then gives both groups a spelling test and compares the results. which of the following is true about this study? a. group 1 is the dependent variable and group 2 is the independent variable. b. this is a correlational study. c. group 2 is the experimental group. d. the independent variable is the type of drink the children receive.

Energy is the total kinetic energy of particles of matter.(chose wisely & pick one) a. mechanical b.thermal c.electrical d.chemical

Which did the need for access to raw materials and markets lead to? a. improvements in transportation b. the industrial revolution c. an increase in immigration