Dolphins. However, while some sharks give birth to live young and others lay eggs, all dolphins give birth to live calves. Copy. After the embryos are fully developed, the mother sawfish gives live birth with an average litter size of about 8 pups. Dolphins give birth to LIVE young, they...
In contrast to oviparous sharks, viviparous sharks give birth to live young. These sharks retain the eggs inside their bodies, where the embryos develop until they are born. The young are typically larger and more developed than those of oviparous sharks, increasing their chances of survival. ...
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 ...
(1)Hard.细节理解题.根据Sharks are facing hard living conditions these days.可知目前的鲨鱼的生活条件艰难.故答案为:Hard.(2)Over 500.细节理解题.根据There are over 500 kinds of sharks living in the oceans.可知有500多种鲨鱼.故答案为:Over 500.
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 larg...
Do whale sharks lay the biggest eggs?Largest Fish In the Ocean:Whale sharks are sharks, not whales, and are the largest fish in the ocean. Sharks are a type of fish that don't have bony skeletons, but have bodies that are supported by cartilage instead. Whale sharks can grow to be ...
Do sharks lay eggs? There are over 500 species of shark living in waters around the world and the majority give birth to live young.The remainder are oviparous, meaning they lay eggs. Around 40 to 50 different shark species live permanently in or regularly visit the waters surrounding Britain...
About 70 percent of sharks are viviparous, meaning they give birth to live young; the remaining 30 percent of shark species — plus near-relatives like skates, rays and chimaeras (an order that includes the spooky "ghost shark") — are oviparous, meaningthey lay eggs externally. ...
Sharks also use touch signals to communicate when they matewith other sharks. It’s done just before the female shark lays her eggs and leaves. Ianother shark swims too close at this point, it can often cause great stress for both of them. It often resultsin injury from scratching each ...
On this hypothesis, people should accept universals like “all cars have radios” and “all sharks attack swimmers” as frequently as they accept minority characteristic universals such as “all ducks lay eggs” and “all lions have manes”. There are, however, some theoretical and empirical ...