For the Cardiovascular system, you will need to locate the Atrium and the Ventricle
For the Mouth, you will need to locate the teeth, pharynx, gill rakers, and tongue.
For the Urogenital Systems:
Kidneys
Rectal Gland
Males: Testes, Epididymis, Vas Deferens, Seminal Vesicle, Sperm Sacs, Siphon
Females: Ovaries, Oviducts, Shell Gland, Uterus