Problem: OPTIONS:
- animals
- clouds
- houses
- plants
Q: Q: The earliest types of what lacked flowers, leaves, roots and stems? A:
Answer: plants

Problem:OPTIONS:
- magnesium
- crystals
- sea salt
- carbonate

Q: What type of minerals are often found where seas once covered the land? A:
****
A: carbonate

Q: What done ozone help protect against? A:
OPTIONS:
- gamma rays
- x-rays
- helium rays
- ultraviolet rays
ultraviolet rays

Q: What are floods a source of on a floodplain? A:
OPTIONS:
- salt
- acids
- minerals
- nutrients

Answer: nutrients

Question: Q: The sequence of bases in a gene translates to the sequence of what protein components? A:
OPTIONS:
- protein acids
- rna acids
- molecular acids
- amino acids
Answer: amino acids

input: OPTIONS:
- a cell wall
- a ribosome
- mitochondrial dna
- a nucleus Now, answer this question: Q: What significant part of the cell do prokaryotic cells lack? A:
A:
output:
a nucleus