Which group of organisms appeared for the first time during the ordovician period?
a. plants that live on land
b. plants that reproduce with seeds
c. single-celled organisms that perform photosynthesis
d. animals with shells or other hard parts

D. animals with shells or other hard parts

common management practices in dairy and poultry farming are: (i) proper shelter facilities and their regular cleaning. (ii) some basic hygienic conditions such as clean water, nutritious food, etc. (iii) animals are kept in spacious, airy, and ventilated place.

answer: national resource conservation services

national resource conservation services is the us. based approach that provides technical and financial assistance for natural resource management. nrcs society in conservation of resources by involving in activities like farmland protection, flood prevention, watershed protection, urban conservation, conserves economic and environmental conditions. it conducts soil surveys and implements the policy of natural resources management on the society.