Christopher Columbus used the presence of suspended seaweed in the ocean to determine how far away he was from the coast of the Africa. Seaweed, or kelp, is
placed under the Protista kingătom. What type of protist did Columbus see?
a)protozoa
b) slime mold
c) water mold
d) brown algae

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