Q: What is the key to the demographic transition? A:

OPTIONS:
- higher birth rates
- higher expatriation
- higher death rates
- reduced family size

Answer: reduced family size

Problem: OPTIONS:
- lack of ogranic
- lack of a emerge
- lack of a cycle
- lack of a backbone
Q: Q: What is one trait that the sponge and tarantula share? A:
Answer: lack of a backbone

Problem:OPTIONS:
- steel
- zinc
- copper
- iron

Q: What do refrigerator magnets contain that make them stick to a refrigerator door? A:
****
A: iron

Q: What layer of earth contains abundant oxygen, which can combine with other elements to create oxide minerals? A:
OPTIONS:
- the core
- the surface
- the tectonic plates
- the crust
the crust

Q: Some flatworms are free-living carnivores that live mainly in which type of habitats? A:
OPTIONS:
- Deciduous forest
- Desert
- freshwater
- aquatic

Answer: aquatic

input with options: Q: What does the central cell develop into after double fertilization? A:
OPTIONS:
- endocell
- xygote
- exosperm
- endosperm
output:
endosperm