Choose the statement that best describes the moon's landscape.

a. sparse vegetation, very little erosion, sandy soil

b. riverbeds with boulders, dust storms, bad weather

c. many craters, maria formed from volcanic eruptions

d. almost flat and featureless with some rolling hills

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.

In which of the following relationships is one organism always benefited while the other organism is always harmed

Which could be a pathway of food through an ecosystem