52) what is the term that refers to difficulty in swallowing that may be caused by obstruction,
inflammation, or trauma?
a) achalasia
b) eructation
c) colitis
d) dysphagia
e) borborygmus

answer; i believe that the correct answer is ; males are hemizygous for the x chromosome;

that scientist would be robert hooke

unicellular organisms, like bacteria, are able to perform all life functions within one single cell. multicellular organisms need many different types of cells to carry out the same life processes. each of these special types of cells has a different structure that it perform a specific function.