The most common type of bacteria that causes community-acquired pneumonia (CAP) is Streptococcus pneumoniae. Other bacteria that cause CAP include Mycoplasma pneumoniae, Chlamydophila pneumoniae, and Legionella pneumophila. Mycoplasma pneumoniae is known to be the main cause of walking pneumonia.
B) population because there is more than one in one species and types
The new DNA molecule is identical to the original DNA.
DNA is replicated through a process called semiconservative replication. The two strands are separated and an enzyme called DNA-polymerase replaces the nitrogenous base for each strand resulting in two identical DNA molecules.
Most probably these scientists will do more studies and experiments in order to learn more about the subject. For example, if they compare plastic grocery bag with paper grocery bag it is important to investigate which one is a better resource use in the life cycles, which one is better for manufacturing or whether one of them can be reused. There are many questions about this issue.