div class=ts-pagebutton class=gotoPage data-page=1Page 1button div class=ts-imageimg data-url=-horners-class-2013-12-23-used-to-transport-substances-down-their-concentrationhtmlpage=1 data-page=1 class=ts-thumb lazyload alt=Page 1: Horners Class · 2013-12-23 · used to transport substances down their concentration gradient In the space provided write the letter of the term or phrase that best completes loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader033vdocumentsmxreader033viewer20220418065e54951083588a0dc8345307html5thumbnails1jpg width=140 height=200 divdiv