Http://my.ccsd.net/userdocs/documents/kmr6l0nsq2LySrGH.pdf
is this what your talking about?
Answer:
D
Explanation:
A topic sentence shows the main idea of the paragraph. D wraps the whole thing up and shows you what the main idea was.
The basal cell has less chlorophyll than the others, and is expanded and fixed firmly to the rock on which the plant grows by the basal surface, rh, thus forming a rudimentary rhizoid.<span>
</span>