Hemoglobin protein is produced by red blood cells, but liver cells from the same organism do not produce hemoglobin protein. Why?

A. The gene for hemoglobin is missing in liver cells
B. the gene for hemoglobin is turned off in liver cells
C. The gene for hemoglobin has mutated in liver cells
D. The gene for hemoglobin is activated in liver cells

Astudent sees several ants walking up a wall following the exact same trail that an ant took earlier. she wants to apply the scientific method to determine how the ants detected the trail. which of these steps would come first in her application of the scientific method? perform an experiment by cleaning the scent away from part of the trail. draw a conclusion that the ants follow a scent trail. make a prediction about what the ants will do after she cleans away part of the trail. hypothesize that the ants are following a scent trail that the first ant left.