An equinox occurs when neither end of earth’s axis is tilted toward or away from the sun the north end of earth’s axis is tilted away from the sun earth’s axis is parallel to the sun’s rays the north end of earth’s axis is tilted toward the sun

The pressurized plants and fungi mentioned in the video have some surprising similarities. what differences would you expect them to have?

Sequence how oxygen accumulated in the atmosphere and the effect it had on life by completing the flowchart

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?