A student conducted an experiment to determine how long it would take for Substance A to freeze. She recorded the substance’s state of matter every five minutes into her data table . In this example, Substance A is a (an) _. A. Control group
B. Independent (test) variable
C. Dependent (outcome) variable
D. Constant variable

The trp operon in e. coli regulates genes that code for enzymes required for synthesis of the repressible operon. when tryptophan is not available amino acid tryptophan. the trp operon is a in the environment, the trp repressor protein activeinactiveregulated. therefore, rna polymerase can bind to the genes to begin transcription.

Aflashlight battery is an example of a) potential energy b) kinetic energy c) thermal energy d) solar energy

According to this food web which of the following would be considered primary consumers