Professor bernstein conducts basic research on the progressive changes in infants' perceptual skills during the first year of life. professor bernstein is most likely a psychologist

Developmental

Explanation:

 The developmental psychologist is one of the type of scientific approach that basically explain about the change, growth and the consistency in the lifespan.

By using the developmental psychologist we can easily studying about the various types of psychological areas such as emotions, social and the cognitive process.

According to the given question, the professor Bernstein conducting the progressive changes by using the basic research method and the professor is a developmental psychologist.  

 Therefore, Developmental psychologist is the correct answer.

giant impact theory - the moon was formed from the collision between earth and another mars-sized body.

colliding planetesimals hypothesis - the moon was formed from the same cloud of material as earth.

capture hypothesis - the moon was locked into orbit by earths gravity as it was passing by it.

accretion hypothesis - the moon was formed from collisions and combining of planetesimals.

i think this is right, if not and you know better let me know.