An investigation must be able to be what?
What is the standard which change is measured? (doesn't change)
The first electron shell contains a maximum of _ electrons
Elements in the periodic table are arranged in order of number of
The principle that a fault or body of rock is youner than any other body that it cuts through
Using the isotope of carbon to date rocks
What cavity houses the reproductive organs?
What cavity is number 2
What is the smallest living unit of an organism?
captures Sun's energy to create sugar for plant cells
Chocolate melting
An organism that makes its own food is called a _______________.