Which of the following cannot become plasma cells?
A. activated b cells phagocytes
B. activated b cells phagocytes and memory t cells
C. activated b cells lymphocytes
D. b cells
E. memory t cells
F. none
G. memory b cells

Which would best keep the oxygen cycle stable? a. cutting down jungles to create farmland b. eliminating parks in large cities c. dumping toxic chemicals into the ocean d. reducing the amount of deforestation d. reducing the amount of deforestation

Which of the following statements is true? a. there are more chromosomes in an organism than there are genes. b. there are more genes in an organism that there are chemical bases. c. dna is made of sugar, phosphate, and carbon. d. genes are found in specific locations on a chromosome.

Based on the topographic map of mt. st. helens, what is the contour interval of the volcano about height is 2,950 m?