A 16‑year‑old has been using marijuana daily for the past year and has developed increasing tolerance along with withdrawal symptoms when abstaining. Which diagnosis is most appropriate?

A core feature of Separation Anxiety Disorder in children, as per DSM‑V, is:

Which of the following is a core diagnostic criterion for Autism Spectrum Disorder (ASD) as per DSM‑V-TR?

Which of the following best characterizes Oppositional Defiant Disorder (ODD) as defined in the DSM‑V?

Lithification is __________________________.

True or False:  Fossils are commonly found in limestone, a non-clastic sedimentary rock.

The Sox9 gene was conditionally knocked out only in the developing gonads. Which of the following correctly describes the genotype and phenotype of these mice?

 A patient is seen in the clinic with severe bowing of the legs, and is found to have a 46, XY karyotype in spite of female appearing external genitalia. Which of the following is the most likely reason for these syndromic symptoms.

In human infants with defects of the 21-hydroxylase enzyme (congenital adrenal hyperplasia), they have high levels of _________ and this results in defects of the ___________ of 46, XX infants. Fill in the blanks with the BEST answer.

Multiple dropdowns. Choose the best answer for each. Melanocytes derive from  [Answer1]  and migrate  [Answer2].