Answer:
They are veins and arteries. The primary function of arteries is to transport highly oxygenated, nutrient-rich blood from our hearts and distribute it to the rest of our body. Veins, on the other hand, are used to pump much-needed blood back to the heart.
Answer:
I think that answer is A
Explanation:
how long ago did the organism lived
The answer is amino acid
the basic building block of a protein is called an amino acid. There are 20 amino acids in the proteins you eat and in the proteins within your body, and they link together to form large protein molecules.
An independent variable is the one that you change and the dependent variable that changes when he independent variable changes.
Water moves upward through a plant through the xylem tissue. Along with water, xylem also transports dissolved minerals, and some small organic molecules. Three factors that influence the flow of sap through a plant include diffusion, transpiration and capillary action. Water transport occurs in a plant's xylem tissue.
