What is a law?
A. a scientific
explanation for a set
of observations that
can be tested
B. a proven,
universal truth that
states what happens
C. a well-tested
explanation as to
why something
occurs that is
generally accepted
D. an assumption
made about an
experiment

If you used an endospore stain with B. megaterium cells and you didn't see green-colored structures in these cells, what are two possible explanations for this observation? What might you do to improve your chances of seeing something green?

a. Terry is allergic to pollen. He develops extremely wateryeyes when exposed to pollen, and has visited you, his doctor, foran explanation. Explain,using scientific terms, what happens toTerry

Describe what happens to the sizes (relative to the rest of the heart) of the sinous venosus and ventricle(s) as you examine (in order) fishes, amphibians, reptiles and birds & mammals. Give a possible biological explanation for the observation.