9. A humpback whale hunts by opening its mouth and lunging forward to scoop up large gulps of seawater and prey. The whale then pushes the water out through the ____ hanging from its upper jaws so that only its food remains. A blowhole B dorsal fins C baleen plates D lower jaw
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Shaiju T.
1) Most countries have outlawed whaling, but some countries have few or no laws protecting whales. Why are conservation groups pushing for world-wide restrictions on whaling? A) Whales are dangerous threats to fishing grounds. B) Whale oil is desperately needed as fuel worldwide. C) Unrestricted whaling could lead to their extinction. D) Oceans are over populated with whales and their numbers need to be reduced or many will starve.
Madhur L.
BIO North Atlantic right whales (Eubalaena glacialis) are one of the largest and rarest marine mammals (adults can weigh up to 70 tons). Right whales move slowly near the surface to feed, and their thick blubber gives them enough buoyancy to float at the surface after they're killed, which explains why whalers called them the "right" whales to hunt. Given this, it's not surprising that centuries of whaling, which ended only in $1949,$ drove the species nearly to extinction. It's estimated that currently only about 400 individuals remain. One of the reasons the population has been slow to recover is that right whales spend much of their time in shallow coastal waters, where they are susceptible to collisions with ships and entanglement in fishing gear. The United States has taken several steps to protect right whales from shipping-related injuries. For instance, ships weighing more than 300 tons are required to report when they enter specific regions off the U.S. coast that are important right-whale habitats. In addition, ships longer than 65 feet are required to slow down to 10 knots or less in certain critical areas, such as whale calving grounds. (Ship speeds are measured in knots, or nautical miles per hour; one nautical mile is 1.151 miles.) In order to guide whale conservation policies, researchers are working to understand what factors affect the severity of injury to whales in a collision. Unfortunately, it's not always easy to gather information about the extent of whale injuries as a result of a particular collision. One approach is to mathematically model the effects of collisions. In one model of a collision between a ship and a whale, the duration of the impact decreases from 0.50 s for a ship moving at 5.0 knots to 0.38 s at 15 knots. Because the collision is this short, forces on the whale from water drag during the collision can be neglected. By how much does the whale's speed change (in knots) as a result of this collision? $$\begin{array}{llll}{\text { A. } 0.95} & {\text { B. } 1.1} & {\text { C. } 2.5} & {\text { D. } 4.1}\end{array}$$
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