Problem:OPTIONS:
- marrow gland
- pineal gland
- adrenal glands
- endocrine gland

Q: Which ductless gland releases secretions directly into surrounding tissues and fluids? A:
****
A: endocrine gland

Q: When food enters the stomach after a period of fasting, a drop in what initiates the conversion of pepsinogen to pepsin? A:
OPTIONS:
- calcium
- white blood cells
- acid
- ph
ph

Q: Matching donor and recipient blood types is important because different blood types have different types of what? A:
OPTIONS:
- antigens
- charges
- coagulants
- antibodies

Answer: antibodies

Question: Q: Why have rivers in arid regions been reduced to trickles? A:
OPTIONS:
- global warming
- rainforest destruction
- emigration
- diversion of water
Answer: diversion of water

input with options: Q: What structure connects the pharynx to the trachea? A:
OPTIONS:
- thyroid
- aorta
- sternum
- larynx
output: larynx

Problem: OPTIONS:
- internal system
- interior system
- shell system
- organ system
Q: Q: Skeletal and muscular are examples of what type of system? A:
Answer:
organ system