C,they are identified by the texture and grain size
Answer:
The heart pumps blood through the circulatory system, delivering needed materials (glucose, oxygen) and picking up waste (carbon dioxide) from cells all over the body. Organs systems work together to efficiently and effectively provide all body cells with their basic needs to carry out life functions.
Vitamin E is an example of a a fat soluble vitamin together with vitamins A, D and K. It is carried to the liver and other tissues by lipoproteins. Vitamin E functions to protect phospholipids in cell membranes from damage by free radicals. It is also important to note that a high intake of vitamin E can interfere with vitamin K's blood clotting activity.
D.
Classical conditioning consists of a learned behavior over time. In this question the bell is stimulating the dogs wanting for food which cues the brain to salivate. Over time, the dog will correlate the bell being rung with food to being time to eat and will start to drool over it whether or not the food is present.
