Answer;
A. Blood
Explanation;
The main organs of the Circulatory system are the heart, the brain, the lungs. There are other key things like arteries, veins, and capillaries but they are not organs.
The major tissues in the circulatory system are the epithelial, muscle, nervous, and connective tissues.
Blood is the main connective tissue in the circulatory system, but it's a liquid connective tissue. Blood tissue is in the same family as bone and cartilage, but instead it has a liquid medium that holds it together.
A flower is a producer, and example of a consumer would be a horse which would eat the flower
I would say shape, hardness, and texture
For a pre-event meal, rich sources of carbohydrates, such as bagels, muffins, and bread, should be eaten two to four hours before an endurance event. Eating a calorie dense meal 2 to 4 hours before an endurance event or smaller meals between 2 to 5 hours before, is absolutely essential for topping of muscle glycogen levels as well as providing blood glucose for the intense activity ahead.
The biosphere is made up of all living things (organisms).
The biosphere includes animals, biomes, population, communities, and ecosystems. The biomes are climate regions which can contain certain types of animals and plants. An ecosystem is all living things in one specific area, also such as plants, animals, and organisms.
