18. which poetry element affects the poem's sound? a. type b. theme c. subject d. rhythm

The poetry element that affects the poem's sound is rhythm, that is, your answer would be D.  Rhythm is a literary device that refers to the patterned reocurrence of certain language features (specially sound) in a regular way.  In English, there are five important rhythms: lamb, trochee, spondee, dactyl and anapest.  They are different patterns of stressed and unstressed syllables.

Example: Shall I compare thee to a summer's day?

This is an example of the type of rhythm known as lamb. It consists of two syllables: the first one is not stressed while the second one is stressed.

B). Angiosperm.

Explanation:

As per the given description about which the teacher is describing exemplify 'angiosperm' as it bears flowers with seeds enclosed in a carpel. Angiosperms are defined as the group that involves plants having ovules enclosed in an ovary which is considered as the characteristic feature of this group. These are the vascular plants for reproducing. Thus, the description of a plant bearing seeds and flowers in which seeds are enclosed by fruits demonstrates 'angiosperm'. Thus, option B is the correct answer.