Really, none of these answers are good. leukocytes are the body's general immune cell, and lymphocytes are a type of leukocyte. Antibodies are only used when fighting an infection that your body already has experience with, so I'm guessing it you have to pick from these answers, its "lymphocytes", but it's not really the best answer.
Nucleolus is located within the nucleus and is site of the ribosomal RNA synthesis
Amniocentesis detects abnormality in chromosomes, genetic disorders, and neural tube defects. Trisomy 21 (Down syndrome) is the most common chromosome abnormality.
Being that my mother is a social worker and she goes to many facilities to give different resources, and is overall great with the community, naturally, I would say it is "Social Workers"
