- (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)
Correct Answer:
D
- (Topic 2)
Correct Answer:
B
- (Topic 2)
Exhibit.
Correct Answer:
A
