Nitrogen has two stable isotopes: N-14 and N-15. Atomic mass of nitrogen is 14.007 amu. How many neutrons are in nucleus of more abundant isotope of nitrogen?

Imaginary element has two naturally occurring isotopes. One of them has atomic mass of 60. amu and abundance 60%, and other one has atomic mass of 65. amu and abundance 40%. What is atomic mass of this imaginary element? Show your calculations.

Which of the following properties describes a solid? Check all.

AHT is formerly known as ___________. (1-3 WORDS)

Brain imaging is always helpful in diagnosing the severity brain injury.

At what age, in Peaks of Maturation in pediatrics, does frontal executive function mature?

Visual deficits are usually not present in a case involving brain injury.

What age, in Peaks of Maturation in Pediatrics, is there an accelerated frontal executive system development?  

Consider the following brain image.   What region of the brain is believed to be most involved in a wide variety of functions including motivation for food, water and sex, memory encoding, and fear responses?  This area is also believed to house the primary reward centers in the brain. 

Which of the following regarding REM sleep is FALSE?