- (Topic 2)
Correct Answer:D
- (Topic 3)
Sunflower sea slurs 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. Giant 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 to fish, including several types of commercially important rockfish.
According to the passage, sea urchin populations
Correct Answer:D
- (Topic 3)
Recently, we have seen the emergence of the food movement, or perhaps we should say "movements." since it is
(i) _____ as yet by little more than the recognition that industrial food production is in need of reform because its social or environmental or public health or animal welfare or gastronomic costs are too
high. As that list suggests, the activists are coming at the issue (ii) _____ . Where many social movements, over time, break into various factions representing differing concerns or tactics, the food movement has been (iii) _____ from its beginning.
Correct Answer:CEG
- (Topic 2)
A certain company made neither a profit nor a loss on the first 1.000 widgets it sold and made a profit of $0.50 on each widget it sold after the first 1.000. If the company's total profit from the sale of widgets was p dollars, what is the number of widgets it sold in terms of p ?
A)
B)
C)
D)
E)
Correct Answer:C
- (Topic 3)
One difficulty in convincing early scientists that craters fanned as a result of impacts from space is that most craters are circular. Impacts could come in at any angle, and experiments firing projectiles in the laboratory show that low-angle impacts lead to elliptical craters, not circular ones. Furthermore, while there was rarely evidence of any impacting object, there was often silicate melt around, suggesting that craters were caused by volcanic processes. The breakthrough in understanding crater origin was the recognition that the shock caused by the impacting object—not the object itself—creates a circular crater some twenty Times larger than the diameter of the impactor. The impact also generates enough heat to largely vaporize the impactor and melt the native rock.
Based on the passage, it can be inferred that research focused on "a classical case of bilingualism"
Correct Answer:E