if phytoplankton has only one atom of mercury in it, and every zooplankton consumes 600 phytoplankton in a year, how many atoms of mercury are there in one zooplankton after a year

Which of the following is not a way in which a vascular plant's xylem and phloem are similar?

Match the functions to the cell types ? contraction and relaxation. conducting electrochemical signals fighting diseases carrying genetic material

Why do some dna fragments move farther than others during gel electrophoresis? a. because their shapes are different b. because they are different types of molecules c. because the samples are different colors d. because their masses are different