A researcher observes an isolated system containing complex organic molecules undergoing spontaneous self-assembly into membrane-bound structures. These structures exhibit rudimentary metabolism but no reproduction or heritability. Which characteristic of life is the MOST significant barrier preventing these structures from being classified as living organisms?

Consciousness is regarded as a defining property of living organisms. Which example best demonstrates consciousness in animals?

A defining feature of living organisms is their ability to respond to stimuli. Which of these is an example of a plant responding to a stimulus?

All living organisms maintain a constant internal environment despite external changes. This process is known as:

An example of metabolism is:

Growth in living organisms is due to:

Which process is essential for the continuity of life?

The basic unit of life is:

All living organisms show:

Which of the following processes demonstrates adaptation in living organisms?