HAL Fran was observing a leaf and a rock with a microscope. Which part of the cell theory might she be investigating?

A organisms are made up of cells
B cells come from pre-exisitng cells
C groups of cells join together to form tissues
D molecules are atoms bonded together

that all the living organisms are made of cells

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.