Problem: OPTIONS:
- oxygen
- potassium
- lithium
- sodium
Q: Q: The net effect of aldosterone is to conserve and increase water levels in the plasma by reducing the excretion of what element, and thus water? A:
Answer: sodium

Problem:OPTIONS:
- proteins
- membranes
- parasites
- antibodies

Q: What do you call large, y-shaped proteins that recognize and bind to antigens? A:
****
A: antibodies

Q: What is used to prevent some infectious diseases? A:
OPTIONS:
- radiation
- pathogens
- pesticides
- vaccines
vaccines

Q: What basic plant structure is the site of photosynthesis? A:
OPTIONS:
- nucleus
- spores
- roots
- leaves

Answer: leaves

Question: Q: Because their cells are arranged in bundles, the appearance of skeletal and cardiac muscles is described as what? A:
OPTIONS:
- quadrant
- cylindrical
- incised
- striated
Answer: striated

input: OPTIONS:
- moon
- the north star
- horizon
- sun Now, answer this question: Q: During summer in the northern hemisphere, the north pole is tilted toward what? A:
A:
output:
sun