It is difficult to determine a definition for life that is suitable for all situations. Instead of defining life, biologists have decided to .

Groups of organisms with low biotic potential, such as gray whales, that produce at most one offspring every other year a) are r-selected b) are k-selected c) are not subject to density-dependent limiting factors d) show the initial stages of the extinction process e) have escaped from the processes of natural selection and adaptation

What is a codon and where is it found

Why do we perceive objects as retaining their brightness under different lighting levels?