Phylum is the correct answer
A recessive gene is simply a gene that is not EXPRESSED! Recessive and dominant do not have anything to do with how "common" they are. Dominant just means it is expressed more often.
Recessive would be for example blue eyes or blonde hair.
Hope this helps!
The
Thymocyte progenitors enter the subcapsular region of the thymus as
double-negative cd3- t cells where the double negative refers to lack of
cluster determinants CD4 and CD8. Double-negative cd3- t cells exist as small population
that is 1%-5% of lymphocytes in the lymphoid organs and peripheral blood of
humans and normal rodents.
They are/were both alive and they are both Animals
Well, it's obvious, because without a transport system, cells wouldn't have the nutrients and things they needed!! And waste wouldn't be able to circulate out of cells.
