If two species have overlapping niches and live in the same community, they typically experience some sort of competition. Use the concepts of niche overlap and competition to explain the invasive nature and success of the cane toad population in Australia.

Recommend a strategy for incorporating sustainable human activity into a tropical rain forest biome.

28. how many linkage groups will be formed by homogametic organism with 28 chromosomes?

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?