# data[].attributes.body
Investigation:how many voltage is needed to make two bulbs  glow brightly.
prediction:we think it will take more than 3 batteries.
Observation:Variables:
Dependent Variables:brightness
independent variables : Batteries.
Constant:bulb

# data[].attributes.body
dependent : sound
independent : batterries
constant:buzzer
we need less than 4.5 volt to wake us up and not let the theif to escape.

# data[].attributes.body
investigation:how much volt battery is needed for the buzzer to  work properly and we can also hear the buzzer and catch the burglar.
prediction: we think we need 4.5 volt battery.

# data[].attributes.body
Investigation:how many voltage is needed to make two bulbs  glow brightly.
prediction:we think it will take more than 3 batteries.
Observation:Variables:
Dependent Variables:brightness
independent variables : Batteries.
Constant:bulb