Leon is listening to his chemistry instructor review the steps for this week's lab assignment. because leon has to understand and follow these directions carefully, would say he is engaged in listening.
a. assertive.
b. empathic.
c. comprehensive.
d. appreciative.
e. engaged.

Comprehensive listening

Explanation:

Comprehensive listening is about comprehending the ideas and words. It is a type of listening that includes the understanding of ideas, thoughts, and concepts. In this of listening the listener should have to understand the meaning of listening.

The listener will understand the vocabulary that is used during the speaking. This type of listening creates a discriminating listening. If a person is not able to understand the sound of a word, he will not able to comprehend the words properly. If a mismatch occurs in vocabulary and sound it will lead to disruption of the comprehension.  

answer; first blank(1); 30% two(2); salmonella; i believe this is correct; //good luck;