Which two subphyla in phylum chordata lack the presence of vertebrae?

as in mitosis, dna replication occurs during interphase.   in meiosis, it occurs specifically in s phase of interphase 1.

the solute can move "downhill," from regions of higher to lower concentration, relying on the specificity of the protein carrier to pass through the membrane. this process is called passive transport or facilitated diffusion, and does not require energy.

examples of nucleic acids are deoxyribonucleic acid (dna) and ribonucleic acid (rna).