Which of the following is a human-made factor that can change climate?
o
a. agriculture
b. respiration
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c. volcanoes
o
d. the solar cycle
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Which is not a characteristic of the animal kingdom? a. they include both vertebrates and invertebrates b. their skin is covered with hair or fur c. they are heterotrophs d. they are eukaryotic

An atom of nitrogen had seven protons in its nucleus. how many electrons does it have

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.