Answer:With this system, blood always flows in only one direction inside the heart. There are also valves at the bottom of the large arteries that carry blood away from the heart: the aorta and the pulmonary artery. These valves keep the blood from flowing backward into the heart once it has been pumped out.
Explanation:
Answer:
in placenta mammals the mother provide food through placenta
Water, vitamins, minerals, and linoleic acid are nutrients the body cannot manufacture or produce in sufficient amounts and thus are referred to as essential nutrients.
The human body needs nutrients to perform its various functions. A nutrient is a substance that enables the body to grow, survive and reproduce. These nutrients are not always synthesized by the body but are taken from the diet. The diet we eat should be balanced and have adequate amounts of nutrients like vitamins, minerals, fats, etc.
Essential nutrients are those nutrients that cannot be processed by the body and thus are required to be consumed through the diet. Vitamins, minerals, fats, proteins, water, and carbohydrates are six essential nutrients.
To know more about essential nutrients, refer to the following link:
brainly.com/question/13047915
#SPJ4
