Aquatic organisms in lakes and ponds are often able to survive the winter underneath a layer of ice, because the water underneath the ice remains liquid. which property of water is primarily responsible for creating these favorable conditions for aquatic life?
a. water is an excellent solvent
b. water has cohesive properties
c. water expands when it freezes
d. water has a high heat capacity

What are some possible short and long term medical concerns for crew members on longer space exploration trips

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?

What was the impact of the concordat of worms?