The human HLA system (human leukocyte antigen) is responsible for identifying and rejecting foreign tissue in our bodies. In humans the HLA system is composed of
hundreds of multiple alleles and can have at least 30,000,000 different genotypes.
An infinite number of combinations of these genotypes is what makes the cells in
our body have a recognition code that is unique for every individual. Which
statement best summarizes an effect of the HLA system.
The HLA system is responsible for problems when the incorrect
blood type is transfused into a recipient.
The HLA system is what causes the rejection of organ transplants
unless it is suppressed by medication
o
The HLA system is responsible for the increase in the number of
bacteria species resistant to antibiotics.
O
The HLA system is destroyed by the infection from the human
immunodeficiency virus resulting in AIDS.

Over the past 60 years, many amphibian species have experienced significant population declines and some species have become extinct. scientists suspected that local human activities such as the destruction of wetlands, regional pollution, and deforestation were the main reasons for these losses. however, research over the past 20 years reveals significant amphibian population declines in protected areas of the world, such as nature preserves and parks. these global declines suggest widespread problems including increased ultraviolet radiation, acid rain, and disease. in switzerland, for example, 14 of the 20 native amphibian species are threatened with extinction. chytridiomycosis is a fungal disease first identified in 1998 as a cause of massive amphibian deaths. in some severely impacted populations, a few individuals have survived, perhaps because of some natural resistance. if these resistant individuals continue to survive and prosper, new resistant populations might emerge. this would be an example of the founder effect artificial selection genetic drift natural selection sexual selection

How can we use spectral lines of light coming from the superclusters to identify which is receding from earth at the slowest rate.

Select all that apply. careful listening skills include: refraining from interrupting the speaker taking quality notes making an effort to understand maintaining eye contact with the speaker