Answer: Digesting food is a chemical change.
Explanation:
Chemical changes cannot be undone so digesting the food is considered a chemical change.
Proteins, carbohydrates, and fats all contain three main elements <em>carbon, hydrogen, and oxygen.</em>
However proteins contain nitrogen, and element not found in carbs or fats.
Hope I helped! :)
Answer:
HIV destroys helper T cells
Explanation:
The evading viruses destroys helper T cells or the CD4+ thus the body can no longer stop some infections. The secondary infections also called opportunistic infections are rampant with people who have AIDS. This is because helper T cells help fight against most infections in the body.
Answer:
<em>The correct option is D) oxygen</em>
Explanation:
The splitting of the water molecules during the light-dependent reactions results in the production of 2 electrons, two hydrogen ions and the formation of oxygen gas. The electrons released by this process make ATP by a process which is known as chemiosmosis. The hydrogen ions released during the light-dependent reactions are converted into NADPH during the light-independent reactions. Oxygen is the by-product and is released into the air. The oxygen is used up by other organisms of the earth for cellular respiration.
The more air is in the jar, the longer the candle will be able to burn. So the candle in jar 3 probably burned for 4 minutes.
The candle in jar 4 would be able to burn much longer then the others, because it has no lid so air can come through and keep the candle burning.
