Answer the following question given this paragraph: Two unique features of mollusks are the mantle and radula (see Figure above ). The mantle is a layer of tissue that lies between the shell and the body. It secretes calcium carbonate to form the shell. It forms a cavity, called the mantle cavity, between the mantle and the body. The mantle cavity pumps water for filter feeding. The radula is a feeding organ with teeth made of chitin. It is located in front of the mouth in the head region. Herbivorous mollusks use the radula to scrape food such as algae off rocks. Predatory mollusks use the radula to drill holes in the shells of their prey. Q: What is a layer of tissue that lies between the shell and the body? Choices: - stem - silt - node - mantle A:
mantle
(Question)
Answer the following question given this paragraph: Q: The burning of what type of fuels is a major source of sulfur oxides and nitrogen oxides? Choices: - biofuels - renewable - synthetic - fossil A:
(Answer)
fossil
Ques: Answer the following question given this paragraph: Membranes Biological membranes surround cells and serve to keep the insides separated from the outsides. They are formed of phospholipid bilayer1 s, which by definition are a double layer of fatty acid2 molecules (mostly phospholipid3 s, lipids containing lots of phosphorus). Proteins4 serve very important functions in cellular membranes. They are active transports in and out of the cell, acting as gatekeepers. They relay signals in and out of the cell. Proteins are the site of many enzymatic reactions in the cell, and play a role in regulation of cellular processes. Q: What is it that surrounds cells and serve to keep the insides separated from the outsides? Choices: - inner membranes - abundant membranes - similar membranes - biological membranes A:
Ans: biological membranes
(Q).
Answer the following question given this paragraph: Even though they are very strong, bones can fracture , or break. Fractures can happen at different places on a bone. They are usually caused by excess bending stress on the bone. Bending stress is what causes a pencil to break if you bend it too far. Q: What usually causes fractures on a bone? Choices: - compressive stress - shear stress - extra weight - excessive bending stress A:
(A).
excessive bending stress
Ques:Answer the following question given this paragraph: Thiols (also called mercaptans), which are sulfur analogs of alcohols, have the general formula RSH. Methanethiol (also called methyl mercaptan), has the formula CH3SH. Ethanethiol (ethyl mercaptan) is the most common odorant for liquid propane (LP) gas. The mild oxidation of thiols gives compounds called disulfides. Q: The mild oxidation of thiols gives compounds called what? Choices: - carbonates - halides - dioxides - disulfides A:

Ans:disulfides
Ques:Answer the following question given this paragraph: Pressure is defined as the force per unit area on a surface. Q: Pressure is defined as the force per unit area on? Choices: - weight - gravity - speed - surface A:

Ans:
surface