"which type of vascular tissue is nonliving, forms a continuous pipeline, and lacks tapered end walls? "

The correct answer is xylem.
 Xylem is a type of plants’ transport tissue. The function of the xylem is to transport water and solutes from the roots to the leaves. The xylem transport system is composed of continuous tubes called xylem vessels. Xylem vessels enable transport (after absorption from the soil through root hair cells) up the stem to the leaves. Water evaporation from the leaves (transpiration) is also mainteined by xylem. Xylem vessels consist of dead cells with a thick, strengthened cell wall with a cellulose and hollow lumen. Vessel element is one of the cell types found in xylem and together with tracheids, is involved in the actual transport.

If you remove all the lions from the savanna it will lead to a increase of gazelle and a increase of cheetahs becasue of no competition