Which structure carries blood to the heart so the heart has its own supply of oxygen and nutrients to perform its function? a)pulmonary artery b)coronary arteries c)superior vena cava d)inferior vena cava

Which best describes what you will do in the reaching your academic potential course?

Which of the following requires the use of energy and the of transport proteins to move a molecule across a cell membrane?

Click an item in the list or group of pictures at the bottom of the problem and, holding the button down, drag it into the correct position in the answer box. release your mouse button when the item is place. if you change your mind, drag the item to the trashcan. click the trashcan to clear all your answers. show the flow of energy in the following ecosystem by labeling each organism's link in the food chain. click once to select a label. click again to place the label in the correct location.