An effective way to ensure the exlusion of children who are ill is to institute a policy for

a-frequent hand washing
b-standard precautions
c-mandatory immunizations
d-daily health checks

no

explanation:

your too far away.

all soils contain mineral particles, organic matter, water and air the combinations determine the soil's properties – its texture, structure, porosity, chemistry and color. soil is made up of different-sized particles. sand particles tend to be the biggest.