Fa particular operon encodes enzymes for making an essential amino acid and is regulated like the trp operon,
a. the amino acid inactivates the repressor
b. the enzymes produced are called inducible enzymes
c. the repressor is active in the absence of the amino acid
d. the amino acid acts as a corepressor
e. the amino acid turns on transcription of the operon

The scientific method is a series of steps followed by scientific investigators to answer specific questions about the natural world. it involves making observations, formulating a hypothesis, and conducting scientific experiments.the steps of the scientific method are •observation-the first step of the scientific method involves making an observation about something that interests you•question-once you've made your observation, you must formulate a question about what you have observed. •hypothesis-once you've made your observation, you must formulate a question about what you have observed. •experiment-once you've developed a hypothesis, you must design and conduct an experiment that will test it.•results-the results are where you report what happened in the experiment. •conclusion-the final step of the scientific method is developing a conclusion.i hope that this you : )

From a high concentration to a low concentration.

Although i don't know what is the simulated system, starfish are predators that eat mostly  microalgae,  snails, sponges, bivalves, mussels and other small marine animals. removing starfish from any system would definitely increase this animals that they prey.

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