Problem:OPTIONS:
- complex progression
- pattern progression
- primary pattern
- primary succession

Q: What's the term for the gradual progression from simple plants to larger more complex ones in an area? A:
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A: primary succession

Problem:OPTIONS:
- emmigration
- erosion
- industrialization
- migration

Q: Typically done to find food or mates, what do you call the regular movement of individuals or populations each year during certain seasons? A:
****
A: migration

Problem:OPTIONS:
- natural modifiers
- addition modifiers
- glass actors
- glass modifiers

Q: Glasses are mixtures of oxides, the main component of which is silica (sio2). silica is called the glass former, while additives are referred to as this? A:
****
A: glass modifiers

Problem:OPTIONS:
- proteins
- carbon
- phosphorus
- urea

Q: Animals can transport what waste material in the circulatory system and store it safely at high concentrations? A:
****
A:
urea