Q: A voltaic cell uses what type of reaction to generate an electric current Read this paragraph and choose the correct option from the provided answers: A voltaic cell uses a spontaneous redox reaction to generate an electric current. It is also possible to do the opposite. When an external source of direct current is applied to an electrochemical cell, a reaction that is normally nonspontaneous can be made to proceed. Electrolysis is the process in which electrical energy is used to cause a nonspontaneous chemical reaction to occur. Electrolysis is responsible for the appearance of many everyday objects such as gold-plated or silver-plated jewelry and chrome-plated car bumpers. Choices: - spontaneous catalyst - chemical reaction - instantaneous redox - spontaneous redox A:
spontaneous redox

(Question)
Q: What connects the fetus to the placenta? Read this paragraph and choose the correct option from the provided answers: The fetus is connected to the placenta through the umbilical cord. Choices: - fallopian tube - microbial cord - eustachian tube - umbilical cord A:
(Answer)
umbilical cord

Ques: Q: Because it produces oxygen, what plant process was necessary for the evolution of animals? Read this paragraph and choose the correct option from the provided answers: Eventually plants evolved. Plants produce oxygen as a product of photosynthesis. Oxygen spread around the planet about 2.5 billion years ago. Many organisms died off because they could not handle the oxygen. But this development was extremely important for other life. Animals need oxygen to breathe. If photosynthesis had not evolved there would be no animals. Choices: - germination - death - reproduction - photosynthesis A:
Ans: photosynthesis

(Q).
Q: Plants obtain the molecules for cellular function though what? Read this paragraph and choose the correct option from the provided answers: Introduction All living organisms need nutrients to survive. While plants can obtain the molecules required for cellular function through the process of photosynthesis, most animals obtain their nutrients by the consumption of other organisms. At the cellular level, the biological molecules necessary for animal function are amino acids, lipid molecules, nucleotides, and simple sugars. However, the food consumed consists of protein, fat, and complex carbohydrates. Animals must convert these macromolecules into the simple molecules required for maintaining cellular functions, such as assembling new molecules, cells, and tissues. The conversion of the food consumed to the nutrients required is a multi-step process involving digestion and absorption. During digestion, food particles are broken down to smaller components, and later, they are absorbed by the body. Choices: - tissues - nutrients - Plants - photosynthesis A:
(A).
photosynthesis

Ques:Q: Which material used in oxyacetylene torches helps cut and weld metals? Read this paragraph and choose the correct option from the provided answers: Note Acetylene is used in oxyacetylene torches for cutting and welding metals. The flame from such a torch can be very hot. Most acetylene, however, is converted to chemical intermediates that are used to make vinyl and acrylic plastics, fibers, resins, and a variety of other products. Choices: - carbon - sulfur - dioxide - acetylene A:

Ans:acetylene

Ques: Q: The addition of heat changes liquid water to what? Read this paragraph and choose the correct option from the provided answers: Choices: - rainwater - ice - distilled water - water vapor A:
Ans:
water vapor