An independent variable is a. directly changed by the experimenter b. manipulated by changes to the dependent variable c. a variable that is kept constant d. a variable that is used as a control

A independent variable is a variable which the experimenter can control and by changing the independent variable the experimenter observes or records the value of dependent variable.

so i see if you are asking independent than the answer is A.

if you are asking dependent variable than the answer may be B because manipulated by changes to the independent variable would be the best answer.

the diploid number of chromosomes is sometimes represented by the symbol 2n. for the fruit fly, the diploid number is 8, which can be written as 2n = 8, where n represents twice the number of chromosomes in a sperm or egg cell.

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.