Researchers have concluded that

A. the proportion of REM sleep to N-REM sleep is similar in infants and adults.
B. REM sleep provides needed brain stimulation to neonates.
C. REM sleep is mostly absent in neonates.
D. the proportion of REM sleep to N-REM sleep increases as a child matures.
70 Examination,

To determine the correct answer, let's analyze the options one by one:

A. the proportion of REM sleep to N-REM sleep is similar in infants and adults.
To find out if this statement is correct, you would need to refer to research studies that specifically compare the proportion of REM sleep to N-REM sleep in infants and adults. These studies would measure and compare the amount of each type of sleep in a representative sample of infants and adults. If the research conclusively shows that the proportions are similar, then this option would be correct.

B. REM sleep provides needed brain stimulation to neonates.
To determine the accuracy of this option, you would need to consult research studies investigating the role of REM sleep in neonates' brain development. This would involve examining studies that explore any potential benefits of REM sleep on brain development in neonates. If multiple studies support the notion that REM sleep provides necessary brain stimulation to neonates, then this statement would be considered correct.

C. REM sleep is mostly absent in neonates.
To confirm the validity of this statement, you would need to search for research studies focusing on the presence or absence of REM sleep in neonates. These studies would examine the sleep patterns and characteristics of neonates and determine the extent to which REM sleep occurs. If the research indicates that neonates experience little to no REM sleep, then this option would be accurate.

D. the proportion of REM sleep to N-REM sleep increases as a child matures.
To verify the truth of this statement, you would need to locate research studies investigating the developmental changes in REM sleep and N-REM sleep proportions in children of different ages. These studies would assess the amount of each type of sleep at various stages of childhood development. If the research consistently demonstrates an increase in REM sleep to N-REM sleep as a child matures, then this option would be correct.

Since you mentioned that this is question 70 of an examination, it is likely that the answer is contained within the material provided to you. You should refer back to your course materials, textbooks, or lecture notes to find the information necessary to determine the correct option.