Four [blank] subunits are need to make a dna molecule

Photosynthesis uses co2 and cellular respiration produces co2. we call the point when the two processes are in balance--when there is no net production of co2--the compensation point. how might you limit one of the processes in order to achieve a compensation point?

Which of the following describes what an activator an enhancer are

Why is carbon the backbone of liveing things