Understanding people as biopsychosocial systems means:

biological factors have the most influence on people, followed by psychological factors and finally social factors.

the nervous system is equal parts biological, psychological, and sociological.

to understand people, we must study how biological, psychological, and social-cultural systems work and interact.

the nervous system is a less important understanding of people that was believed a decade ago.

psychology is the central component in the understanding of human behavior.

the real answer is b. scintillation counter

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.