Natural selection is the mechanism that A. increases the chance of certain individuals reproducing.
B. leads to increasing variation within a population.
C. allows a weaker species to reproduce more frequently.
D. explains why populations produce more offspring than the environment can support.

please help asap

it is either A or B but I think a

heat a spark and oxygen

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.