Semi-conservative DNA replication means that one stand is new DNA and the other contains a newly synthesized strand.
B. Crab
is your answer
An crab has an exoskeleton
hope this helps
In low light no plants grow. With no plants no animals can eat so less animals remain or stay there. With less animals less animals respire and breathe out CO2.
The organic matter, or hydrocarbon raw material, is derived primarily from petroleum and natural gas.
Over 90% of the organic chemicals are produced from petroleum and natural gas routes nowadays. Even though the manufacturers search for alternatives because of the prices of the petroleum and natural gas, and look to replace them little by little, still these two are by far the dominant ones.
