Which three steps describe how an animal obtains and uses energy for growth?
First, an animal eats another organism. Then, food is built into larger molecules. Next, the animal's cells use molecules to
make new cells.
First, food is built into larger molecules. Then, the animal eats another organism. Next, the animal's cells use molecules to
make new cells.
First, an animal eats another organism. Then, food is broken down into smaller molecules. Next, the animal's cells use
molecules to make new cells.
First, food is broken down into smaller molecules. Then, the animal eats another organism. Next, the animal's cells use
molecules to make new cells.

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?