Answer:
It cannot reach us by conduction or convection as there is no medium such as air in most part of the space between the earth and the sun. From the sun the heat comes to us by another process known as radiation. The transfer of heat by radiation does not require any medium.
Answer:
Nails are made of iron. Iron consists of 26 protons and 26 electrons. protons are positively charged and electrons are negatively charged, so this force of attraction keeps the electrons together.
If electrons repel from each other, the positively charge protons and nucleus allow them to move in a definite orbit and prevent them flying out of the nail.
1. Bacteria are also very important to some industries such as the production of cheese, yogurt, buttermilk, vinegar, and sauerkraut.
2. They are used in the preparation of antibiotics such as Streptomycin.
3. They are used in the tanning of leather and hides
4. They are used in the curing of tobacco (not a good thing, but notable at least�)
<span>5. Methane-producing bacteria are used in sewage treatment plants to convert the sludge into methane gas.</span>
Answer:
Blood enters the right atrium and passes through the right ventricle. The right ventricle pumps the blood to the lungs where it becomes oxygenated. The oxygenated blood is brought back to the heart by the pulmonary veins which enter the left atrium. From the left atrium blood flows into the left ventricle.
Explanation:
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