When it comes to creatures at the top of the food chain in the ocean , sharks are at the top. Sharks have a long history on Earth, dating back at least 420 million years, 100 to 200 million years earlier than dinosaurs! However, sharks have not changed much in appearance over the past few hundred million years, except for minor adjustments in their feeding structure and a more streamlined body shape, which have evolved to allow them to swim faster and hunt more efficiently. There are many types of sharks, and there are at least 440 species of sharks in the ocean. They vary greatly in shape and size. For example, the largest whale shark can be up to 18 meters long, as big as a bus, while the dwarf dogfish is only 20 centimeters long, about the same size as a crucian carp. Image source: National Maritime Museum official account |
<<: A seemingly romantic killer - thick "fog" ahead
>>: [Creative Cultivation Program] Can edible straws be eaten as pasta?
Dirac is a unique figure in the history of scienc...
As long as you have a computer with internet acce...
Introduction: According to reports, Ms. Li, a pat...
Many new products are doing very well, but people...
Today, we will talk about practical techniques fo...
© Behance Leviathan Press: Mind-wandering, also k...
Cheese is one of people's favorite dairy prod...
Dear users and partners: Good afternoon, everyone...
[51CTO.com Quick Translation] For the past 16 yea...
Crow, I believe everyone knows this bird. As the ...
Humans have long used the naked eye and optical t...
When it comes to water sources, the first thing t...
Written by Skin Want to set an extraordinary spor...
Birds are an important part of the ecosystem. Eff...
In early June this year, I saw Fritillaria thunbe...