Many people believe sharks鲨鱼)are dangerous and willalways try to hurt or even killhumans. In fact, 94 percent of theworld's 400 species are harmless to humans.A shark exhibition at the National AquariumBaltimore, the US, proves this. Visitors can touchyoung sharks, see their eggs develop ...
Many people believe sharks(鲨鱼)are dangerous and will always try to hurt or even kill humans.In fact,94 percent of the world’s 400 species are harmless to humans. A shark exhibition at the National Aquarium Baltimore,the US,proves this.Visitors can touch young sharks,see their eggs ...
题目Today ,more and more sharks(鲨鱼)die because of humans' activities.Sharks are facing hard living conditions these days.As we know ,sharks are among the oldest animals on earth.There are over 500 kinds of sharks living in the oceans.Most of them are quite large and...
living in the oceans. Most of them are quite large and they are about two meters long. Yet some are small , for example, the dogfish shark is less than 20cm long. The shark has a strong sense of smell. This sense helps sharks find their food. Sharks eat fi...
)are dangerous and will always try to hurt or even kill humans. In fact, 94 percent of the world’s 400 species are harmless to humans. A shark exhibition at the National Aquarium (水族馆) in Baltimore, US proves this. Visitors can touch young sharks, see their eggs develop and watch ...
Sharks have many bones in their bodies.( T )2. Some sharks remain moving for their entire lives because they must keep moving water over their gills to get oxygen.( T )3. Some sharks give birth to live sharks and others lay eggs.( T )4. After pups are born, they swim away ...
Sharks Have Been Around For A LONG Time! Would you believe that sharks have existed for millions of years? In fact, they evolved long before dinosaurs! The fossil record of cartilaginous fish goes back 450 million years to the Paleozoic era.Sharks themselves began to appear about 400 million ...
Most sharkshave several rows of teeth. When a shark loses a tooth, anotherone moves up to take its place. Sharks do not lay eggs like otherfish. Their newborn sharks can swim fast and hunt food atbirth.How do scientists learn about sharks?They study them up close in the ocean. For...
Are there any sharks in the Black Sea? Are blue whales an endangered species? Why do whale sharks have spots? Are there sharks in Arctic Ocean? Do whale sharks lay the biggest eggs? Do sperm whales eat sharks? How fast are whale sharks?
Alligators and sharks don’t usually hang out in the same places. Sharks prefer coastal ocean waters while American alligators usually hang out in marshes, swamps, and wetlands. Run-ins between sharks and alligators aren’t exactly common, but they do occasionally cross paths and, when they do...