Cellular respiration shows carbondioxide going from 1. Abiotic to abiotic
2. Biotic to abiotic
3. Biotic to biotic
4. Abiotic to biotic

Hey me with this one❤❤❤❤ every organism needs food. does a cell also need it? explain very briefly.

What are the doorways into and out of cells, attached to the membrane, and built in the rough er.

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?