Where does sea-floor spreading take place? a.
convergent boundaries
c.
oceanic volcanoes
b.
transform boundaries

What will happen if two of the base pairs of the stand of the dna are switched

What happens to the amount of waste in the pond as the ecosystem ages?

Cancer cells spread to other parts of the body by entering the bloodstream. which of the following organs could prevent a cancer cell in the bloodstream from spreading, and why? a. the spleen, because it releases lymphocytes into the blood b. the peyer's patches, because they release lymphocytes into the blood c. the lymph nodes, because they release lymph into the blood d. the thymus, because it releases lymph into the blood