The first protective external structure of living organisms must have been

Question

Quizplus · Accepted Answer

Semi-permeable membranes would have provided the first protective external structure for living organisms, as they are essential for keeping the inside of the cell separate from the outside environment, allowing for selective transport of materials into and out of the cell. The other options (methane and ammonia, amino acids, primordial soup) are all relevant to theories of the origin of life, but do not specifically relate to the first protective external structure.

The First Protective External Structure of Living Organisms Must Have