Which of the following is not one of the 3 necessary and sufficient conditions for natural selection?

a) a trait must exhibit variation
b) there must be differential survival as a result of having different versions of a heritable trait
c) a trait must be heritable
d) there must be differential reproductive success as a result of having different versions of a heritable trait

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explanation:

bc blah

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.

your spelling is a little off : ]

a unit of heredity that is transferred from a parent to offspring and is held to determine some characteristic of the offspring.