The complexity of life, combined with our limited knowledge: O is overcome by the science of taxonomy
O is circumvented by objective analysis
O sometimes prevents conclusive classification
O always prevents classification

Which statement describes a way in which the digestive and excretory systems work together? a. the nephrons absorb nutrients from food going to the large intestine. b. the excretory system balances blood gases in the small intestine. c. the intestinal villi filter blood and send wastes to the bladder. d. the excretory system balances the salts and water obtained from digested food

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

Which of these is not a nucleotide base found in dna?