Which of these make up the vascular tissue?
a sclerenchyma
b collenchyma
c parenchyma
d phloem

The answer is D phloem.

Vascular plants have specialized tissues that can transport fluids - vascular tissue. This tissue consists of xylem and phloem. Xylem transports water and minerals from the root to the upper parts of the plant. Phloem transports food and nutrients from the leaves, where they are produced, to the growing or storage parts of the plants. 

correct answer is option a.

tropopause, stratopause and mesopause have all in common aspect that is point of maximum temperature in its layer of the atmosphere. all layers of atmosphere observe abrupt change in temperature. tropopause is the boundary between troposphere and stratosphere. stratopause is the boundary between stratosphere and mesosphere. mesopause is the boundary between mesosphere and thermosphere. these all boundaries are ranges between altitude of 0 to 80 km.

i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.