When these ligaments or folds come together, they prevent food from entering the lower respiratory tract.

A) Vocal folds
B) Vestibular folds
C) Cricothyroid ligaments
D) Epiglottic folds
E) Both "Vocal folds" and "Vestibular folds" are correct.

______ with anatomically modern features existed in Africa about 195,000 years ago.

A) Homo antecessor
B) Homo neanderthalensis
C) Homo heidelbergensis
D) Homo sapiens
E) Homo erectus

Microtubules found in spindle fibers are capable of assembling and disassembling.

The posterior tibial artery is a continuation of the ________ artery.

A) popliteal
B) femoral
C) iliac
D) peroneal
E) fibular

Which of the following is derived from endoderm?

A) Brain
B) Muscle
C) Epidermis of the skin
D) Mucosa of the digestive tract
E) Cardiovascular system