Problem: OPTIONS:
- rivers
- lakes
- seas
- oceans
Q: Q: Where do most red algae species live? A:
Answer: oceans

Problem:OPTIONS:
- weather energy
- geothermal energy
- solar energy
- wind energy

Q: What energy source, now making a comeback, has helped propel ships and pump water for many years? A:
****
A: wind energy

Q: Excretion of ions occurs mainly through what organ? A:
OPTIONS:
- Heart
- lungs
- tissues
- kidneys
kidneys

Q: The hexapoda subphylum includes mainly what type of animal? A:
OPTIONS:
- spiders
- mammals
- birds
- insects

Answer: insects

Question: Q: The earth is like organisms in that it maintains a stable state, which is also known as what? A:
OPTIONS:
- ketosis
- hibernation
- dormancy
- homeostasis
Answer: homeostasis

input: OPTIONS:
- salts
- proteins
- platelets
- iron ions Now, answer this question: Q: What is critical for the formation of hemoglobin? A:
A:
output:
iron ions