Answer:
The valves The heart has four valves - one for each chamber of the heart. The valves keep blood moving through the heart in the right direction.
Explanation:
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Answer: Blood to kidney excretory tubes,
- Air tubes to blood
- Blood to air tubes.
The body contains several internal exchange systems. In the kidney, metabolic wastes move from BLOOD to KIDNEY EXCRETORY TUBES. In the lung, oxygen moves from AIR TUBES to BLOOD, while carbon dioxide moves from BLOOD to AIR TUBES.
Explanation: In the kidney, metabolic wastes move from the blood to the kidney excretory tubes via the affarent arteriole into the glomerulus of the bowman's capsule from where there will be ultrafiltration of the wastes from the blood will take place followed by selective reabsorption and tubular secretion inorder for urine to be formed.
In the lungs,oxygen moves from the air tubes which are the bronchial tubes then to the alveoli where gaseous exchange takes place then the oxygen moves to the blood. While carbondioxide moves from the blood to the air tubes from where there is exchange of gases then the carbondioxide is exhaled/expired from the lungs.
Farming and the surplus of food allowed humans to focus on activities other than food production, which led to the division of labor and the creation of new social classes-True.
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Explanation:</u></h3>
Farming refers to those activities that are associated with the cultivation of crops and growing livestock. When the crops that are cultivated exceed the nation of a particular nation, then it leads to the surplus of food. In that situation, the governments will take necessary steps for storing the cultivated crops for the future usage.
When different works are allotted or assigned to different workers for the completion of certain tasks and also for improving the efficiency refers to the division of labors. When the Framing and the surplus of food exits it makes them to concentrate on the activities other than farming and this will increase the division of labor and the creation of new social class.
