10. Some owls produce 2 pellets per day. Assume each pellet represents 80g of biomass. Also assume that one 40g vole can cause 50 cents of crop damage to a farm per season. If a barn owl family of seven (2 adults [producing 2 pellets/day) and 5 young [producing 1 pellet/day]) lives on a farm for 12 weeks and feeds exclusively on voles, how much will the farmer save in crop damages over the course of a season?​

The nervous system interacts with the endocrine system by a. using hormones as connections b. sending nerve impulses directly to glands c. using neuroendocrine cells as connections d. sending neurotransmitters directly to neurons

What goes in and out of a cell respiration?

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?