Biology, 26.01.2020 09:31, kyliewassup
Why are birds that inhabit areas with high acid deposition more likely to lay eggs with thin shells?
a. acid deposition acts as an endocrine disruptor that interferes with reproductive hormones in bird species.
b. high rates of cancer due to acid deposition impact birds ability to form eggs.
c. in acidic soils calcium, an important nutrient for eggshell production, washes away and so less is available to birds in their diets
d. acid deposition increases the effects of ddt which has already been implicated in thinning eggshells?
Answers: 3
Biology, 22.06.2019 04:30, dondre54
African penguins, which inhabit the coasts of southern africa, were classified as an endangered species in 2010. two significant threats to their survival are ecosystem damage from oil spills and overfishing by humans. overfishing depletes the food supply of african penguins. the best method to reduce the threat of overfishing would be to . the risk of oil spills could be reduced by increasing the use of , which should oil consumption. if an oil spill does occur, could be used to remove the oil so the ecosystem may more quickly recover.
Answers: 2
Biology, 22.06.2019 13:00, mimivenga
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?
Answers: 1
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