This is possible because proteins are created from different combinations of amino-acids. While we only have 20 different kinds of aminoacids, these 20 kinds can create thousands of combinations that we can observe in our bodies and bodies of other mammals as well as other organisms.
Answer:
Cell,tissue,organ,organ system
Explanation:
I already took this test
Feral rock pigeons were screened for neutralizing antibodies to West Nile virus during late winter/spring and summer of 2002 and 2003. Additionally, virus isolation from serum was attempted from 269 birds collected during peak transmission
Qualitative deals w/ colors, formation of gas, observable traits
quantitative is measurable like the heights of items (meters, km, miles)
