This is an example of a support sentence. A support sentence is one that provides examples or additional information about a particular topic. These contain details that help describe the main idea of the paragraph. In other words, they "support" this idea. Supporting sentences are found in the middle section of a text, as they appear after the topic sentence but before the conclusion.
Support sentences form the body of a paragraph. They provide facts and examples to develop the idea of the topic sentence. In the excerpt, the support sentences supply information about the koala "bear." For example, they describe, among other things, the kind of animal it is and its physical appearance.
'Well spoke' means that you said it in an excellent way. It means that you used great vocabulary and how you structured the sentence was amazing. Keep up the great work, since a professor complemented you! xD