makes them go faster
Not actually. There were several different marine reptiles that had mammalian characteristics, notably the group known as pelycosaurs. The earliest mammals appeared early in the Age of Reptiles (Mesozoic Era), but were uniformly small in size. The group called synapsids took an evolutionary path to mammals while the sauropsids became today's reptiles and birds.
The gestation periods for mammals differs greatly. In general it appears to be very short in small mammals, (some shrews and mice are only a few days) while increasing in length as the mammal increases in size. Elephants, hippos, bears whales and other large mammals have gestation periods lasting 9 to 18 months.
Yes! they are small in size.
Meteors. Usually they are very small objects, about the size of a grain of sand.Meteors. Usually they are very small objects, about the size of a grain of sand.Meteors. Usually they are very small objects, about the size of a grain of sand.Meteors. Usually they are very small objects, about the size of a grain of sand.
Small to medium grain size.
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makes them go faster
Not actually. There were several different marine reptiles that had mammalian characteristics, notably the group known as pelycosaurs. The earliest mammals appeared early in the Age of Reptiles (Mesozoic Era), but were uniformly small in size. The group called synapsids took an evolutionary path to mammals while the sauropsids became today's reptiles and birds.
No, they came later. During the last two periods of the Mesozoic (Jurassic and Cretaceous) all the mammals were small and primitive, as the dinosaurs held all the important positions (called "niches"). When the dinos shuffled off, the mammals began to expand in size and complexity to fill the vacancies.
The hollow bones and feathers of birds made them better adapted to their environment than the flying reptiles which became extinct during the Cretaceous Period. Sources: My science book and my own knowledge
Nothing. Mammals can be as small as a mouse or large as a whale.
Most snakes feed on small mammals, birds, amphibians, other snakes, etc. Some of the larger snakes will take small deer, small to medium size pigs, and other small to medium size animals.
just like other mammals do. There is a small hole at the bottom of their tail. The size of a small pebble. They go like a fish.
actually helpful, imagine one of these things the size of even a small crane, though, some science fiction writers have!
The length of a kangaroo's small intestine is moderate in length compared to other mammals the length varies depends on the size of the kangaroo.
just like other mammals do. There is a small hole at the bottom of their tail. The size of a small pebble. They go like a fish.
There are individual mammals that are bigger than individual reptiles, and there are individual reptiles that are bigger that individual mammals. However, the average size of all extant mammals is larger than the average size of all extant reptiles. Most reptiles are lizards and snakes, which are usually small. Only a few species of tortises, alligators, crocodiles, caimans, and very large snakes are big. Most mammals are bats, rodents, and shrews, which are usually small, but there are still hundreds of mammals that are big, including the biggest animal on the planet: the blue whale. There are more large mammals than there are large reptiles.