The speed of a mechanical wave through a medium depends on the type of medium. it also depends on the type of mechanical wave. which statement is true?

all waves travel at the same speed if no medium is present.

electromagnetic waves require a medium, but mechanical waves do not.

all waves travel at the same speed through any medium.

mechanical waves require a medium, but electromagnetic waves do not.

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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.