The correct definitions are as follows
significant figures
those digits in a number that have true value
scientific method
ordered steps a scientist uses in his or her work
liter
standard metric unit of volume
theory
suggested or proposed solution to a general scientific area of inquiry
meter
standard metric unit of length
hypothesis
possible answer to a scientific problem
scientific notation
system of writing numbers as a multiple of a power of 10
experimentation
doing repeated tests to verify a hypothesis
metric system
system of measurement based on the number ten
exponent
the number of times a base number is multiplied times itself, shown as a superscript
second
standard unit of time
law
scientific fact which provides repeatable results and has never been falsified