help blood clot following wounds, so that wounds stop bleeding. Most of blood is made of the yellow-colored liquid . blood cells are part of the immune system and fight off infections. Blood must reach every single cell in the body. In order to do this, blood flows through the , which are small blood vessels, often only 1 cell thick. Most carry oxygen-rich blood away from the heart and are coded red in anatomy diagrams. Blue-colored blood vessels indicate low-oxygen blood and are called . The is the main artery out of the heart, taking freshly-oxygenated blood from the left ventricle to deliver to the rest of the body. The right ventricle pumps blood to the lungs through the ; this is typically colored blue even though it carries blood away from the heart. is a waste gas that is carried by blood back to the lungs.

How many species of living things are alive on earth today? more than 1,000,000 none of these answers are correct 100-500 1,000 –500,000 o 500,000 -1,000,000

When rutherford performed his metal foil experiment, he was surprised that most of the alpha particles

What evidence could be used to convince policy makers to change a shipping lane from going through a whale breeding ground? information on the number of all whale species currently alive information on the number of all whales hit by boats in the given area information on the number of whale deaths in the world's oceans information on the number of whale offspring born every year. (a) scientists could collect and combine data on fish populations all around the world to show that their populations are declining. (b) scientists collect and combine data on fish populations all around the world to show that their populations are increasing. (c) scientists work together and use past data to show that fish populations are becoming locally extinct in some areas. (d) scientists work together and use past data to show that some fish populations are adapting to environmental changes.