How did early land animals differ from those common today?

Cells tend to have a relatively small and uniform size. why aren’t cells larger?

Jason, a dog breeder, decides to mate a poodle with a golden labrador retriever. he wants to get puppies with the curly hair of the poodle and the color of the labrador. what concept is shown in this example? question 6 options: artificial selection adaptation evolution natural selection

Why does the earth spin slowly, not faster? is it possible to prove it scientifically? can you prove it with math?