Parasitism, mutualism, and commensalism are
examples of symbiotic relationships. All symbiotic
relationships exist between
a. organisms from the same species that live in direct
contact with one another.
b. organisms from two different species that live in
different ecosystems.
c. organisms from two different species that live in
direct contact with one another.
d. organisms from the same species that live in
different ecosystems.

Option C. organisms from two different species that live in direct contact with one another.

Explanation:

Parasitism, mutualism and commensalism are the types of symbiotic association in which both the organisms belong to different species that live in direct contact with one another. In mutualism , both the organisms get benefits and in parasitism, one gets benefit and other get harm.

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.