input: OPTIONS:
- hematopoietic organisms
- cell clusters
- multicellular organisms
- unicellular organisms Now, answer this question: Q: Exchange occurs directly with the external environment in what type of organisms? A:
A:
output: unicellular organisms

Q: What does the presence of gill slits suggest about humans and fish? A:

OPTIONS:
- Shared History
- Common Cells
- Same evolutionary chain
- common ancestor

Answer: common ancestor

Problem: OPTIONS:
- super
- unsaturated
- oily
- saturated
Q: Q: Carbon atoms are bonded to as many hydrogen atoms as possible in what type of fatty acids? A:
Answer: saturated

Problem:OPTIONS:
- absorption
- filtration
- permeation
- diffusion

Q: By what process does oxygen enter the pores of flatworms? A:
****
A: diffusion

Q: What are the two main minerals found in ocean water? A:
OPTIONS:
- dioxide , chloride
- quartz, carbon
- carbon , chloride
- sodium, chloride
sodium, chloride

Q: The first period of the paleozoic era was called what? A:
OPTIONS:
- carboniferous
- permian
- ordovician
- cambrian

Answer:
cambrian