Based on values for the volume per gram of the given materials,which of the following would NOT float in water (density = 0.997 g/cm3) ? 
Definitions:
Neurotransmitter
Chemicals in the brain that transmit signals from one neuron to another across synapses.
Excitatory
Pertaining to or causing an increase in activity in the body or brain, often referring to neurotransmitters that promote the firing of neurons.
Fertility
The natural capability to produce offspring.
Childbirth
The process of delivering a baby and placenta from the uterus to the outside world.
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