The exposure of certain types of radiation
Answer:
i think the answer is a
Explanation:
the Hardy-Wienberg principle is used to explain the unchanging frequency of alleles and genotypes
The answer should be coal.
Hope this helps
Primary succession takes place when barren land is exposed and made available for plant growth.
The first step is the retreat of the glacier. Next, pioneer species begin to inhabit the exposed land. These species include lichens and they break down rocks and create soil. Some years later, more complex plants start growing in the soil and insects also begin to inhabit it. The remains of all of these organisms add nutritional value to the soil. As soil thickens, more complex plants and animals inhabit the region, until finally, the soil is thick enough for entire forests to grow.
