Geologists searching for clues to the ancestors of modern-day vertebrate land animals should look in layer of the fossil beds.

Geologists searching for clues to the ancestors of modern-day vertebrate land animals should look in layer 2 , of the fossil beds.

As the fossils get older,  the fossils will be buried deeper within the layer of the fossil beds. Within layer 2 of the fossil beds, Geologist could found the fossils that came from ancient sera Valli an age

That is true tge cactus as a structural adaptation to its envirinment has it leaves reduced to spines. but this doesnt mean it cant produce food it produces food because of the presence of chlorophyll in its stem