What are the constants (controlled variables)? Select all that apply. * 2
Number of daphnia
Heart rate of daphnia
Type of petri dish
Different concentrations of caffeine solution
Amount of liquid
✓ Type of microscope
Species of daphnia

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the sphincter muscles at the end of the digestive tract is the anus.

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.