Answer the following question given this paragraph: The oxygen atoms, however, form oxygen gas, which is a waste product of photosynthesis. The oxygen given off supplies most of the oxygen in our atmosphere. Before photosynthesis evolved, Earth's atmosphere lacked oxygen altogether, and this highly reactive gas was toxic to the many organisms living at the time. Something had to change! Most contemporary organisms rely on oxygen for efficient respiration. So plants don't just "restore" the air, they also had a major role in creating it!. Q: Plants not only contribute food but what else for organisms? Choices: - dioxide - hydrogen - carbon - oxygen A:
oxygen
(Question)
Answer the following question given this paragraph: Alkali metals are all solids at room temperature. They are relatively soft and low in density. Q: What property are alkali metals at room temperature? Choices: - mixed - liquid - solid - solid A:
(Answer)
solid
Ques: Answer the following question given this paragraph: The space shuttleand any other rocket-based systemuses chemical reactions to propel itself into space and maneuver itself when it gets into orbit. The rockets that lift the orbiter are of two different types. The three main engines are powered by reacting liquid hydrogen with liquid oxygen to generate water. Then there are the two solid rocket boosters, which use a solid fuel mixture that contains mainly ammonium perchlorate and powdered aluminum. The chemical reaction between these substances produces aluminum oxide, water, nitrogen gas, and hydrogen chloride. Although the solid rocket boosters each have a significantly lower mass than the liquid oxygen and liquid hydrogen tanks, they provide over 80% of the lift needed to put the shuttle into orbitall because of chemical reactions. Q: What do rocket-based systems use to propel itself into space? Choices: - water reactions - hydrogen reactions - nuclear reactions - chemical reactions A:
Ans: chemical reactions
(Q).
Answer the following question given this paragraph: Mollusks are divided into ten living classes, including the familiar gastropods, cephalopods, and bivalves. Q: Gastropods, cephalopods, and bivalves are examples of what class? Choices: - animals - invertebrates - cetaceans - mollusks A:
(A).
mollusks
Ques:Answer the following question given this paragraph: Type 2 diabetes occurs when body cells are no longer sensitive to insulin. The pancreas may still make insulin, but the cells of the body cannot use it efficiently. Being overweight and having high blood pressure increase the chances of developing type 2 diabetes. Type 2 diabetes usually develops in adulthood, but it is becoming more common in teens and children. This is because more young people are overweight, due to a high sugar and fat diet, now than ever before. Q: In what type of diabetes can the pancreas still make insulin, but the cells of the body cannot use it efficiently? Choices: - type 3 diabetes - type 1 diabetes - type A diabetes - type 2 diabetes A:

Ans:type 2 diabetes
Answer the following question given this paragraph: The three general transfers are believed to occur normally in most cells. These describe the normal flow of biological information. DNA is replicated, DNA is transcribed into RNA, and RNA is translated into protein. The three special transfers are known to occur under special conditions, such as with some viruses. The three unknown transfers are not believed to occur. Q: What is dna transcribed into after being replicated? Choices: - protein - diploid chromosomes - gene - rna A:
rna