they discovered that whale sharks give birth to live babies. A pregnant female that died had more than three hundred babies , or pups , growing inside her . The growing sharks were 16 to 24 inches ( 42-63 cm ) long . Some were more deve...
A. The skin of a shark can be used like leather. In Asia, people enjoy a kind of soup made from shark fins. It takes most kinds of sharks10 to 15 years to begin reproducing (繁殖)and most sharks reproduce only every two years. And they give birth to fewer than ten young sharks. ...
give birth to live sharks.Baby sharksare called pups.After they are born,they swim awayquickly so the mother shark does not eat them.Sharksconstantly lose teeth,but they are always making newteeth.Sharks have an amazing sense of smell andhearing,which helps them hunt for food.一、选出下列...
Sharks give birth to live young, with some species having litters of up to 100 pups. However, some sharks lay eggs, either externally or internally. The sand tiger shark, for example, has two uteri and can carry up to 50 fertilized eggs at a time, with only one pup surviving in each ...
小题5: If too many sharks in one area are killed, the group of shark may never return to normal population levelsA.The others give birth to live young.B.Sharks are important for the health of the world's oceans.C.This is a threat to other form of life in the ocean.D.Collectors ...
Tiger sharks mate, with the male inserting a clasper into the female to release sperm and fertilize her eggs. The gestation period for tiger sharks is believed to range from 13 to 16 months, and a female can produce a litter every two years or so. Tiger sharks give birth to live young...
Scientists studied epaulette sharks,which live off Australia and New Guinea.They found that warmer conditions sped up the sharks' growing process.That meant the sharks were born earlier and very tired.The findings could be used in the study of other sharks,including those that give birth to live...
Around 25% of all sharks lay eggs. Most sharks do not lay eggs and instead give birth to live young that have developed inside the mother’s body. The eggs of oviparous (egg-laying) sharks are encased in leathery pouches known as “mermaid’s purses”, which protect the embryo as it...
Sharks eat fish, other sharks, and plants that live in the ocean. Sharks grow slowly. About forty percent of all sharks lay eggs. The others give birth to live young. Some sharks carry their young inside their bodies as humans do. Some sharks are not able to reproduce until they are ...
The others give birth to the live young. Some sharks carry their inside their bodies. Most sharks bite (咬) people by mistake. They think a is a large sea animal. When the sun goes down or comes up, sharks are food. So at these times people go swimming in the ocean. Each year, ...