Energy can be measured in calories, 1,000 calories is called a kilocalorie (kcal), If the producers have 10,000 kcal of energy and 10% is transferred to the primary
consumers, how much energy is transferred?

100 kcal
1,000 kcal
10 kcal
Plz help me which one is it

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?