Scientists land a big fish: How did sea life evolve into land animals? A new fossil find may hold the answerJim Ritter
How did genes related to walking first evolve? The little skate (Leucoraja erinacea) is a cartilaginous fish related to rays and sharks (as opposed to bony fish, including sarcopterygians). It is another fish that “walks” underwater on fins like legs, mimicking the movements of land-based...
根据第五段These fossils show that jawed fish were already thriving in the world's ancient oceans at that time.Later on,more diverse and larger jawed fish evolved and began to spread around the world,paving the way for some fish to eventually go on land and evolve into ...
Ancestral elephants had to adapt or go extinct. At that time, they were still relatively small animals, the size of a tapir, with a short trunk only. We hypothesise that a bigger brain enabled more behavioural flexibility: to be more exploratory, to migrate to look for food, to cope with...
Did bear species ever migrate between continents? Yes, bear species did migrate between continents. For instance, it’s believed that ancestors of the American black bear migrated to North America from Asia via theBering land bridgeduring the Ice Ages. ...
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Like other species, we are the products of millions of years of adaptation. Now we're taking matters into our own hands.
Going back 15 years ago, only two relevant fossils were discovered: one of a fish and one of a tetrapod. But the answer to the question "how did the fish evolve into the tetrapod?" was left to pure speculation. The most popular such speculation was done in the '50s by the Harvard pa...
The ancestors of whales lived on land -- there is evidence of the evolution of the whale from life on land to life in the sea (read How Whales Work for details), but how and why did this happen? The "why" is commonly attributed to the abundance of food in the sea. Basically, whal...
How did marine organisms adapt to land? How are nekton adapted to life in the sea? How do animals adapt to freshwater biomes? How have humans adapted to the marine biome? How is a sea urchin's defense against predators different from that of a starfish?