In a repeated-measures experiment, each individual participates in one treatment condition and then moves on to a second treatment condition. one of the major concerns in this type of study is that participation in the first treatment may influence the participant's score in the second treatment. this problem is referred to as
a. individual differences
b. homogeneity of variance
c. bi-treatment effect
d. order effects

while the heads of the phospholipid structure attract water, the tails are hydrophobic. the model shows how the hydrophilic section folds around the fluid molecules to bring them into the cell so they don’t need to pass through the hydrophobic tails.  

option d : from a warmer substance to a cooler substance

according to second law of thermodynamic, heat flows from higher to lower temperature region. heat is the transfer of energy from an object at higher temperature to an object at a lower temperature. so energy flows from warmer to colder objects.