An injury to the radial nerve will inhibit the ability to the elbow.

The answer extends the elbow. The radial never severs the posterior upper arm (triceps) and runs down the arm to the wrists and fingers. As the  nerve terminates, it branches into deep and superficial sensory nerves.   Therefore injury to the nerve will also cause numbness in the fingers and wrist.

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.