A. Immune system
It helps our bodies fight everything that comes in our path.
Answer:
Naming binary (two-element) covalent compounds is similar to naming simple ionic compounds. The first element in the formula is simply listed using the name of the element. The second element is named by taking the stem of the element name and adding the suffix
Answer:
Sunlight will not be properly absorbed
Explanation:
Plants rely heavily on sunlight to produce their own food through the process called photosynthesis. Photosynthesis occurs in leaves of plants because they contain most of the chlorophyll in the plant. Acid rain weakens the integrity of the plant by dissolving its waxy protective covering. So when the leaves get damaged, it limits their absorption of sunlight which is integral in the food making process of these plants. Limitations will cause a deficiency, or in other words, it will not be able to produce enough food for it to sustain its health.
The valves are responsible for preventing blood from flowing in the wrong direction, they are present in the veins, and the arteries don't need them because the aorta (biggest artery) pumps or in other words pushes it with such a force that no other force can change its direction, in the veins there is no structure present for pumping them as a result we have got valves so that they go in one direction...... the meaning of the word valve is to allow in one direction