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Groups of dolphins can often be scen bobbing in and out of waves close to the shorcline根据文章内容选择正确答案。()1 Marine mammals live A. in the forest B. on nd C in the water1) in the desert(2are most closely related to the dolphin A.Whl B. Sharks C.Cat D. Squid()3. ...
根据第三段Researchers have found that whales and dolphins evolved(进化)from four-legged mammals,like the hippo,which once lived on land.Meanwhile,seals and sea lions are closely related to dogs.It seems that these ancestors grew rapidly in size when they returned to the oceans,but the new ...
has used large arrays of hydrophones to listen to whales with particularly deep calls. Blue whales and fin whales – the largest in the ocean – make noises at very low frequencies which means the sound can travel for many kilometres. This helps the animals, which are sometimes quite solitary...
Molecular and genetic evidence have demonstrated that whales and dolphins (Order Cetacea) are most closely related to the hippopotamuses and should thus nest within this order. Some authors have proposed renaming the order "Cetartiodactyla" to reflect the new combination, while other have suggested ...
Are Whales Related to Hippos? Kraig Becker For well over a century, scientists debated whether hippopotamuses and whales were related: The relationship between cetaceans and land-based ungulates was first proposed in 1883. Before the breakthroughs in molecular science of the late 20th and early 21st...
The blue whale, the world's largest animal, can consume up to 16 tons of plankton daily, which has major implications for ocean health.
Their skeletons also elucidate the relationships of cetaceans to other mammals. Morphological cladistic analyses have shown cetaceans to be most closely related to one or more mesonychians, a group of extinct, archaic ungulates, but molecular analyses have indicated that they are the sister group ...
The pygmies are named for their physical resemblance to right whales, but on a molecular level are more closely related to rorquals such as humpback and blue whales. Both families belong to the baleen whale group, the Mysticetes. The gray whale belongs in its own family, and other groups—...
D.To introduce the animals that can recognize human faces.2. Why were the archerfish chosen as test subjects? A.They are cleverer than other species. B.They have sharp vision and hearing. C.They aren’t closely related to humans. D.They spray water to hit the prey.3. What is the aut...