Which of the following describes an independent variable? A. The factor in an experiment that is not under observation B. The factor in an experiment that is deliberately kept the same C. The factor in an experiment that is deliberately changed D. The factor in an experiment that responds to the manipulated variable​

25) a student takes four samples of a white crystalline solid and places each in a well plate. on top of each sample, she carefully places 20 drops of clear mystery liquids a, b, c and d. her results for each well are: liquid a: the solid dissolves quickly. liquid b: the solid appears unchanged. liquid c: a brownish colored liquid is produced. liquid d: fizzing occurs and the well becomes warmer. in which well does a physical change occur?

What is the primary goal of human communities?

Aheterozygous normal male marries a woman with a sickle cell anemia. give the genotypes and possible phenotypes of the offspring