Which of the following lacks a digestive tract?
a) a shark.
b) a tapeworm.
c) a snail.
d) an earthworm.

During an experiment, readings for blood pressure in a persons body were found to be constant . however , when he measured by a different blood pressure cuff , the readings differed by 15 points for each reading. this difference indicates that the results are

Hemoglobin is a proton that carries oxygen around your body what is hemoglobin made from

How are viruses different from eukaryotic cells?