What does Darwin’s theory of evolution explain about the natural world

1). All living organisms are constantly involved in 'a struggle for existence'.

2). In a population, those that tend to survive and reproduce are the individuals whose variations gives them competitive advantage over the rest.

Explanation:

Darwin, thus, identified environmental pressures as the main cause of natural selection. They cause favourable variations to accumulate and unfavourable ones to be weeded out. Over thousands of generations, favourable variations, naturally selected by he environment, accumulate sufficiently to give rise to new species from ancestral species. Therefore, according to Darwin, natural selection, acting through environmental pressure, is the driving force behind evolutionary change in the natural world.

1: most common garden plants prefer loam — soils with a balance of different-sized mineral particles (approximately 40% sand, 40% silt, and 20% clay) with ample organic matter and pore space. however, some plants grow better in sandy soils, while others are well-adapted to clay soils.

2: available water capacity is the maximum amount of plant available water a soil can provide. it is an indicator of a soil's ability to retain water and make it sufficiently available for plant use. available water capacity is the water held in soil between its field capacity and permanent wilting point.

3: it is the same for all living things (plants and animals). it also includes very tiny organisms that our eyes cannot see. they are known as microorganisms, and include viruses, bacteria and fungi.