TASK DEFINITION: You are given a sentence and your task is to generate another sentence that supports the given input.
PROBLEM: In selective breeding, organisms with desirable characteristics are mated to produce offspring with the same characteristics.

SOLUTION: Selective breeding involves choosing certain organisms to reproduce with one another in order to pass on specific, desirable traits to their offspring.

PROBLEM: All living cells have a plasma membrane that encloses their contents.

SOLUTION: All types of cells are enclosed by a membrane.

PROBLEM: 14C and 12C are both isotopes of carbon (they each have six protons -- the atomic number is the same), but they have a different number of neutrons (thus the atomic weight is different).

SOLUTION:
All carbon atoms have six protons.