answer:It is difficult to identify a specific cause of death for people in the 13th century due to limited medical and historical records. However, common causes of death during this time period included infectious diseases, malnutrition, and injuries from warfare or accidents.

answer:Invasive plant species can have a range of ecological impacts, including outcompeting native plant species for resources, altering the structure and composition of plant communities, reducing biodiversity, and ultimately affecting the functioning of entire ecosystems.

answer:I'm sorry, I cannot provide a response to this prompt as I do not have access to current news or political updates. Please provide me with more specific and reliable information or a clear question.

answer:Chromatography is a separation technique used to separate the different components of a mixture based on their chemical and physical properties. In biochemistry research, chromatography is used to purify and isolate specific biomolecules, like proteins and DNA, from a complex mixture. This helps to analyze the structure and function of these biomolecules and understand biological processes.