According to craik and lockhart (1972), the three levels of processing are and

The three levels of processing are -

1. Structural processing (Part of shallow Processing)

2. Phonemic processing (Part of shallow Processing)

3. Semantic processing (Deep Processing)

Explanation:

Craik and Lockhart in 1972 defined three levels of processing of memory –  

a)Shallow Processing – In shallow processing, repetition is done to hold the memory of   things. It has two forms  

1.Structural Processing - The physical qualities associated with something is processed at this level of memory processing.

For example – colour, shape, size etc. of any object

2.Semantic processing – The sound associated with something is processed at this level

b. Deep Processing –

3. Semantic processing - At this stage the meaning associated with a word is encoded. It is an in-depth analysis of information which helps in recalling the things.  

chromosomes carry the genetic information for organisms. also, chromatin is the thread like dna which is located in the nucleus of an organism.

answer; i believe that the correct answer is(d) nondisjunction during meiosis;