Alfredo looks at a thin scraping of a lettuce leaf under the microscope. He identifies certain cell structures he had learned about in class. He recognizes plant cells have some structures that are different from animal cells. What structures might he see in a plant cell that would not be present in an animal cell? Choose the three that apply. A. cell wall B. cell membrane C. chloroplasts D. large vacuoles E. ribosomes F. mitochondria

Which statement correctly describes a step-up transformer? a. it increases the amount of electric energy available. b. it increases the voltage of an electric current. c. it changes direct current into alternating current. d. it has more loops of wire in its primary coil.

Calculate the ratio of h+ ions to oh– ions at a ph = 6. find the concentration of h+ ions to oh– ions listed in table b of your student guide. then divide the h+ concentration by the oh– concentration. record this calculated ratio in table a of your student guide. compare your approximated and calculated ratios of h+ ions to oh– ions at a ph = 6. are they the same? why or why not? record your explanation in table a. what is the concentration of h+ ions at a ph = 6? mol/l what is the concentration of oh– ions at a ph = 6? mol/l what is the ratio of h+ ions to oh– ions at a ph = 6? : 1

Determine the age of a fossil if it had only one eighth of its original carbon-14 content remaining?