In the deep waters of the ocean, coral reefs are found in abundance. algae live on these coral reefs, providing nutrition and producing pigments that give color to the corals. the corals offer shelter to the algae. so, they share a association. climate change has led to increased temperatures and has caused the corals to throw away the algae living inside them. this action causes the corals to be bleached because of a lack of pigment. this change will lead to

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Approximately what wavelength of light is best absorbed by chlorophyll a

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?