A dichotomous key works on the principle of asking yes-or-no questions about the organism. To identify it, the answers for that organism are then compared to existing organisms to identify it. Prepare a list of four to five questions about each of the organisms listed below to help you create your own key. For each question, make sure the answer isn’t the same for all four organisms. For example, Does the organism have cells? would be an inappropriate question, because all the organisms have cells. brewer’s yeast (Saccharomyces cerevisiae) E. coli bacteria (Escherichia coli) green hydra (Hydra viridissima) house cat (Felis catus)

Here's the list of questions, the yes-no response for each has been provided under each organism's heading in the same order:

Brewer’s yeast (Saccharomyces cerevisiae)

E. coli bacteria (Escherichia coli)

Green hydra (Hydra viridissima)

House cat (Felis catus)

Hope that answers the question, have a great day!

Answer hears  the list of questions, the yes-no response for each has been provided under each organism's heading in the same order:

Is it a unicellular organism?

Is it found inside the human body?

Is it visible without a microscope?

Can it produce its own food?

Can it be used in making food?

Brewer’s yeast (Saccharomyces cerevisiae)

Yes

Yes

Yes

No

Yes

E. coli bacteria (Escherichia coli)

Yes

Yes

No

No

No

Green hydra (Hydra viridissima)

No

No

Yes

Yes

No

House cat (Felis catus)

No

No

Yes

No

Nor:

Explanation:

answer: if she breaths she a thho

explanation:

it provides an alternative energy pathway for the reaction to proceed.

a catalyst is a substance that speeds up the rate of a chemical reaction but is not consumed during the course of the reaction.

catalysts increase the rate of reaction without being used up. they do this by lowering the activation energy needed. with a catalyst, more collisions result in a reaction, so the rate of reaction increases. different reactions need different catalysts.

a catalyst works by providing an alternative reaction pathway to the reaction product. the rate of the reaction is increased as this alternative route has a lower activation energy than the reaction route not mediated by the catalyst.