Why is the drug delivery system considered during the development of new pharmaceuticals

Depending on the organism the number of in a cell may change

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?

Explain how paleontologists use trilobite fossils as index fossils for various geologic time periods.