Help please. Potatoes are specialized stems called tubers. Potato tubers have two functions. (1) These thick terms are used to store food. (2) The eyes on the stems, seen here, are used to

A) absorb water.

B) grow new plants.

C) make more sugar.

D) collect oxygen for respiration.​

Which experiment would most likely contain experimental bias ?

During convection, less dense fluid rises and denser fluid sinks.

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?