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sample
Fruit Flies
They're called 'subjects'
fsed
all subjects receive treatment's
sample
they have a semipermeable membrane
Replication
Johannes Hendrik Schoeman has written: 'The catecholamine excretion during rest, maximal and submaximal exercise in active, semi-active and sedentary subjects' -- subject(s): Catecholamines, Excretion
A sample is a group of subjects such as selected from a population. A population deals with all different kinds of subjects that are being studied.
Many branches of science do not lend themselves to experiments. Cosmology or astrophysics are subjects where it is extremely difficult to conduct experiments. Theories are developed though thought experiments which are then used to make testable predictions. It is only at the later stage that experiments enter the picture.
Because of the cruelty of his "experiments," which resulted in the deaths of his "subjects."