(i couldn't find science)

which statement about a dichotomous key is true?

1. a dichotomous key is based on the temporary actions of an organism.

2. a dichotomous key may include a question that has three or more answers.

3. a dichotomous key may have a group with no organisms in it.

4. a dichotomous key is complete when each organism stands alone.

A dichotomous key is complete when each organism stands alone

Explanation:

A dichotomous key is used to track a required species of plant or organisms based on its distinct characteristics using series of question and answers to the question. The answer of previous question asked leads with option to ask another question.

This method is useful to both expert as well as non-experts. this method is effective when there is single species than group of species. Problem may arise when there are many organisms with closely related characteristics.

This can be minimized by the scientific and systematic classification and preparation of effective set of questionnaires.

the answer is a or when it says crossing over

b is the correct answer