4. how do many scientists explain the formation of the earth?

Earth formed around 4.54 billion years ago, approximately one-third the age of the universe, by accretion from the solar nebula. Volcanic outgassing probably created the primordial atmosphere and then the ocean, but the early atmosphere contained almost no oxygen.

Explanation:

the answer is d. chordata

because they are eaten by the frog and the frog getseaten by the snake and the snake by the eagle