A. Marine mammals are not harmed by supersonar. B. The supersonar has an adverse effect on marine mammals. C. The military is deeply concerned about the welfare of dolphins. D. Marine mammals think supersonar is another mammal. 相关知识点: 试题...
Because of this, Canadians are engaged in a mamssive slaughter of seals on the Atlantic coast and clamouring for a sea lion killed on the Pacific coast. The Namibians are killing some 60,000 seals each year. The Japanese are slaughtering dolphins; fishermen in California are killing and mai...
marine mammals. What Economos (1979, p. 449) did provide was a length-massRelations, SizePlatt, If
In rock units where the sections are less complete, the time frame is longer-even as much as a million years. In marine rocks (rocks formed in seas or oceans) the record is often more complete. It is here that the earliest and some of the strongest evidence for an extraterrestrial (...
Other Small Marine Mammals Here's where it gets a little murky to determine which marine mammal is the smallest. There are somecetaceansthat are around the same length as the otter. Two of the smallest cetaceans: Commerson's Dolphin, which grows up to 189 pounds and is about 5 feet long...
What are some examples of animals that have features of both mammals and reptiles together? Name two things which make mammals different from other vertebrates. What makes monotremes unique mammals on earth? What is the difference between mammals and reptiles?
While the African elephant takes the prize for biggest land animal, there are some other categories with impressive superlatives. Largest land predator: When it comes to currently living land mammals that hunt and eat other animals, polar bears win the prize for largest. Male polar bears (Ursus...
Polar bears are marine mammals unlike all the other bears living throughout the world. They live in the Arctic, they can swim long distances, their paws are very big, and they know how to productively use them! Polar bears can reach up to six miles per hour in the water and their favo...
Many shark species are targeted for their fins, which are highly valued in some cultures. It is very important that we reduce the threat from harmful fishing practices, better protect the habitats of these key marine species, and raise public awareness about their importance to ocean health. ...
is very deep.In some places it is much deeper.Nearly half of the world's seas are over 3,000 meters.Animals in the oceans(5)___ mammals (哺乳动物) such as dolphins and whales and many kinds of marine fish.They are able to swim(6)___ underwater and dive to great depths. Everybo...