- (Topic 2)
Al. Ben. Carl, Dina. and Edna are to be seated in a row of 5 adjoining chairs, with 1 person sitting in each chair. If Dina and Edna must each be seated m the first chair in the row or the last chair in the row. in how many different seating arrangements can the 5 people be seated"1

Correct Answer:B

- (Topic 3)
Despite the general _____ of Roman archaeological studies toward the major cities and their
monuments, archaeology has contributed much to a better understanding of rural developments in Roman territory.

Correct Answer:DE

- (Topic 3)
Sunflower sea stars help maintain certain kelp forest ecosystems by eating quickly reproducing prey species such as urchins, thus keeping populations low. Without the sea stars, the urchin population explodes, which is bad news for kelp forests and everything in them. Gianl kelp can grow to 150 feet underwater at a speed of two feet a day. but their weaknesses are their holdfasts. which are akin to tree roots. The holdfasts are home to brittle stars, prawns, and snails, among other creatures. Urchins like to eat the kelp holdfasts. Once the holdfasts are gone, the rest of the kelp drifts oft* in the tides. In this way. urchins can destroy the forests, which, higher up. are also home (o fish, including several types of commercially important rockfish,
The passage compares kelp holdfasts to tree roots in order to

Correct Answer:B

- (Topic 3)
In the 1980s the press release announcing the discovery of a new fundamental particle turned a once _____ hypothesis of interest to no more than a few hundred physicists into an undisputed fact of global significance.

Correct Answer:C

- (Topic 2)

Correct Answer:C

- (Topic 3)
Adapting to its changing environment and building its own ecological niche in interactions with other disciplines, the scientific discipline of ecology can be seen as highly _____ .

Correct Answer:C