The top layers are the youngest and the farther you go down, the older they get. I’ll put it in exact order in a minute.
DNA replication is called transcription, because the new strands are transcribed (copied) from the original molecule. Hope this helps!!
It is B. 3 categories of fish...category Agnatha (aka jawless fish)
category Chondrichthyes (aka cartilaginous fish)
category Placodermi (aka armoured fish)
