Answer the following question given this paragraph: Habitat Loss Humans rely on technology to modify their environment and replace certain functions that were once performed by the natural ecosystem. Other species cannot do this. Elimination of their habitatwhether it is a forest, coral reef, grassland, or flowing riverwill kill the individuals in the species. Remove the entire habitat within the range of a species and, unless they are one of the few species that do well in human-built environments, the species will become extinct. Human destruction of habitats (habitats generally refer to the part of the ecosystem required by a particular species) accelerated in the latter half of the twentieth century. Consider the exceptional biodiversity of Sumatra: it is home to one species of orangutan, a species of critically endangered elephant, and the Sumatran tiger, but half of Sumatra's forest is now gone. The neighboring island of Borneo, home to the other species of orangutan, has lost a similar area of forest. Forest loss continues in protected areas of Borneo. The orangutan in Borneo is listed as endangered by the International Union for Conservation of Nature (IUCN), but it is simply the most visible of thousands of species that will not survive the disappearance of the forests of Borneo. The forests are removed for timber and to plant palm oil plantations (Figure 21.8). Palm oil is used in many products including food products, cosmetics, and biodiesel in Europe. A 5-year estimate of global forest cover loss for the years from 2000 to 2005 was 3.1 percent. Much loss (2.4 percent) occurred in the humid tropics where forest loss is primarily from timber extraction. These losses certainly also represent the extinction of species unique to those areas. Q: The part of the ecosystem required by a particular species is endangered when human activity threatens loss of what? Choices: - primary producers - primary speciation - biodiversity - habitat A:
habitat
Answer the following question given this paragraph: Vectors in Two Dimensions A vector is a quantity that has magnitude and direction. Displacement, velocity, acceleration, and force, for example, are all vectors. In one-dimensional, or straight-line, motion, the direction of a vector can be given simply by a plus or minus sign. In two dimensions (2-d), however, we specify the direction of a vector relative to some reference frame (i. , coordinate system), using an arrow having length proportional to the vector's magnitude and pointing in the direction of the vector. Figure 3.9 shows such a graphical representation of a vector, using as an example the total displacement for the person walking in a city considered in Kinematics in Two Dimensions: An Introduction. We shall use the notation that a boldface symbol, such as D , stands for a vector. Its magnitude is represented by the symbol in italics, D , and its direction by . Vectors in this Text In this text, we will represent a vector with a boldface variable. For example, we will represent the quantity force with the vector F , which has both magnitude and direction. The magnitude of the vector will be represented by a variable in italics, such as. Q: Displacement, velocity, acceleration, and force are examples of what type of quantity that has magnitude and direction? Choices: - cycles - wave - frequency - vector A:
vector
Q: Answer the following question given this paragraph: Because of their freely moving electrons, metals are good conductors of electricity. Metals also can be shaped without breaking. They are ductile (can be shaped into wires) and malleable (can be shaped into thin sheets). Metals have these properties because of the nature of their metallic bonds. Q: The nature of what gives metals the properties of being ductile and malleable? Choices: - liquid bonds - magneticism - titanium bonds - metallic bonds A:
A: metallic bonds
Question: Answer the following question given this paragraph: Finally, air passes from the bronchi into smaller passages called bronchioles. The bronchioles end in tiny air sacs called alveoli. Q: What is the name for the tiny air sacs at the end of bronchioles? Choices: - gills - vacuoles - ganglion - alveoli A:
Answer: alveoli
*Question*
Answer the following question given this paragraph: A circuit that consists of two loops is called a parallel circuit. If one loop of a parallel circuit is interrupted, current can still flow through the other loop. Q: A circuit that consists of two loops is called a what? Choices: - diverse circuit - unnatural circuit - complex circuit - parallel circuit A:
**Answer**
parallel circuit
(Q).
Answer the following question given this paragraph: Vertebrates are animals that have a backbone. All of them are placed in the Phylum Chordata. Modern vertebrates include fish, amphibians, reptiles, birds, and mammals. Only about 5 percent of animal species are vertebrates. Q: What do we call animals that have a backbone and belong to the phylum chordata? Choices: - organelles - mammals - invertebrates - vertebrates A:
(A).
vertebrates