Rebecca has a streptococcus bacterial infection. the back of her throat is inflamed on the left and right sides. what can the lymphatic system do to rebecca fight this infection?
the lymph vessels can transport the bacteria to immune system cells.
the tonsils can produce lymphocytes to fight the infection.
the blood vessels can drain the fluids to lower inflammation.
the thymus can drain the bacteria from the throat.

Which statements best describe the differences or similarities between a comparative investigation and an experimental investigation? check all that apply. experimental investigations are best for showing cause-and-effect relationships, while comparative investigations do not necessarily show this type of relationship. comparative investigations are often impractical and unrealistic, while experimental investigations are the most practical and realistic kinds of investigations. comparative investigations allow for the use of a wide range of variables but do not have a control group, while experimental investigations involve variables that can be controlled. both experimental investigations and comparative investigations are designed to answer scientific questions. both experimental investigations and comparative investigations focus on making observations rather than collecting new data.