HELP! You have made it half way through the course. How do you feel you are doing in this class so far? Are there any topics that give you issues or you do not fully understand? Answer in at least one full sentence.

In which situations is the principle of cross-cutting relationship useful in determining relative age?

The vaccine in a flu shot contains weakened flu viruses. how does a flu shot work with the immune system? a. it destroys lymphocytes. b. it destroys macrophages. c. it activates macrophages. d. it activates lymphocytes.

When new rock is added to an oceanic ridge, the magnetized strips on either side of the ridge are evidence of sea-floor spreading. this is because the rocks on the two sides of the ridge o are equal in width and in polarity are polar opposites oare magnetized vary in width but are equal in polarity