Does anyone know this answer??

During the first month of development, how many layers of cells make up the embryo? a. 1 b. 2 c. 3 d. 4

Use the list below to answer the question: abnormal behavior criteria: • ? • distressing • dysfunctional to be diagnosed with a disorder, an individual must exhibit behavior that meets three criteria. what term completes the list? a. deviant b. diagnosed c. disturbing d. disabled (i think it’s disturbing but i’m not sure! if you know the answer pls comment and i’ll give brainliest if right)

The structure shared between the male reproductive system is the