Answer the following question given this paragraph: Chemical reactions vary widely in the speeds with which they occur. Some reactions occur very quickly. If a lighted match is brought in contact with lighter fluid or another flammable liquid, it erupts into flame instantly and burns fast. Other reactions occur very slowly. A container of milk in the refrigerator will be good to drink for weeks before it begins to turn sour. Millions of years were required for dead plants under Earth's surface to accumulate and eventually turn into fossil fuels such as coal and oil. Q: Exemplified by a lit match bursting into flame or the process that forms fossil fuels, chemical reactions vary greatly in terms of what? Choices: - duration - density - power - speed A:
speed
(Question)
Answer the following question given this paragraph: 29.5 Birds Birds are endothermic, meaning they produce their own body heat and regulate their internal temperature independently of the external temperature. Feathers not only act as insulation but also allow for flight, providing lift with secondary feathers and thrust with primary feathers. Pneumatic bones are bones that are hollow rather than filled with tissue, containing air spaces that are sometimes connected to air sacs. Airflow through bird lungs travels in one direction, creating a crosscurrent exchange with the blood. Birds are diapsids and belong to a group called the archosaurs. Birds are thought to have evolved from theropod dinosaurs. The oldest known fossil of a bird is that of Archaeopteryx, which is from the Jurassic period. Modern birds are now classified into two groups, Paleognathae and Neognathae. Q: What is the technical term for species that produce their own body heat and regulate their internal temperature independently of the outside temperature? Choices: - hydrostatic - Phototrophic - osmotic - endothermic A:
(Answer)
endothermic
Ques: Answer the following question given this paragraph: Mother of pearl is also known as nacre. Nacre is the iridescent inner shell layer. It can be found in buttons, watch faces, knives, guns, and jewelry. It is also used to decorate various musical instruments. Q: What is another name for mother of pearl? Choices: - pigment - enamel - calcium - nacre A:
Ans: nacre
(Q).
Answer the following question given this paragraph: Figure 26.16 A compound microscope composed of two lenses, an objective and an eyepiece. The objective forms a case 1 image that is larger than the object. This first image is the object for the eyepiece. The eyepiece forms a case 2 final image that is further magnified. Q: What two lenses comprise a compound microscope? Choices: - polarized and focal - scope and focus - concave and convex - objective and eyepiece A:
(A).
objective and eyepiece
Ques:Answer the following question given this paragraph: Though viruses are not considered living, they share two important traits with living organisms. They have genetic material like all cells do (though they are not made of cells), and they can evolve. The genetic material of a virus can change (mutate), altering the traits of the virus. As the process of evolution has resulted in all life on the planet today, the classification of viruses has been controversial. It calls into question the very definition of life. Q: Though viruses are not considered living, they share two important traits with living organisms: they have genetic material and they can undergo what process? Choices: - generation - sexual reproduction - learning - evolution A:

Ans:evolution
Ques:Answer the following question given this paragraph: Heat is the energy that flows as a result of a difference in temperature. We use the symbol for heat. Heat, like all forms of energy, is measured in joules. Q: What is the energy that flows as a result of a difference in temperature? Choices: - electricity - polarity - magnetism - heat A:

Ans:
heat