The majority of t cells of the naive lymphocyte pool wait for the encounter with foreign antigens in the

1. loamy sand is about 80% sand with 10% clay and defined mostly by sand particles with some clay to provide structure and fertility. the sand particles are easily visible and the soil holds structure but breaks apart easily.

2. scott sand can improve his soil quality by incorporating more silt and organic matter into the soil. peat moss and organic matter can also be incorporated.

the dark variety, as they are not visible on the dark tree barks

explanation: