Visit the National Weather Service website, and click the area where you live. (If you are using a mobile device, click the squares beneath the main map.) The colored bar gives the intensity of rainfall in increasing order. The image below will help you interpret the amount of rain expected in your location. The intensity of energy (Z) reflected back to the Doppler radar is measured in decibels and expressed as dBZ. The color scale is included with each map on the website. the legend for the colors used in weather maps indicating precipitation intensity from very light to extreme Part A What does the Doppler radar show happening around your town or a town of your choice right now?

Astudy by solloch and et. al., in 2017, gives the map above which shows the frequency of alleles with a ccr5-delta32 mutations over 87 different countries. this mutation deletes the presence of a co-receptor (ccr5) on the outside of human t-cells (lymphocytes). some viruses, such as the one responsible for the black death and human immunodeficiency virus (hiv), require this receptor for attachment to host cells during the infection process. the black death was an epidemic that passed over northern europe during the 14th century killing nearly 60% of europeans. according to this information, which explanation best explains why northern europeans show a greater immunity for hiv than some other parts of the world?