Answer the following question given this paragraph: To determine the overall voltage of a particular voltaic cell, simply combine the voltages of the oxidation and reduction half reactions. Even if you need to take a multiple of a half reaction for the electrons to cancel, do not take the multiple of the E1/2. Use the values directly as is from - ball-ch14_s03_t01. Spontaneous redox reactions have positive overall voltages. If the voltage of the reaction as written is negative, it is not spontaneous in that direction. Rather, the reverse reaction is the spontaneous redox reaction. Q: Combining the voltages of the oxidation and reduction half reactions helps to determine what? Choices: - slimy - moisture - magnetic - voltage A:
voltage
Answer the following question given this paragraph: Sympatric speciation While the logic and mechanisms of allopatric speciation are relatively easy to grasp (we hope), there is a second type of speciation, known as sympatric speciation, which was originally more controversial. It occurs when a single population of organisms splits into two reproductively isolated communities within the same physical region. How could this possibly occur? What stop (or inhibits) the distinct sub-populations from inbreeding and reversing the effects of selection and nascent speciation? Recently a number of plausible mechanisms have been identified. One involves host selection.143 In host selection, animals (such as insects) that feed off specific hosts may find themselves reproducing in distinct zones associated with their hosts. For example, organisms that prefer blueberries will mate in a different place, time of day, or time of year than those that prefer raspberries. There are blueberry- and raspberry-specific niches. Through a process of disruptive selection (see above), organisms that live primarily on a particular plant (or part of a plant) can be subject to different selective pressures, and reproductive isolation will enable the populations to more rapidly adapt. Mutations that reinforce an initial, perhaps weak, mating preference can lead reproductive isolation - this is a simple form of sexual selection (which we will discuss soon).144 One population has become two distinct, reproductively independent populations, one species has become two. Q: Sympatric type of what occurs when a single population of organisms splits into two reproductively isolated communities within the same physical region? Choices: - biodiversity - extraction - accumulation - speciation A:
speciation
Q: Answer the following question given this paragraph: Spinal Cord Development While the brain is developing from the anterior neural tube, the spinal cord is developing from the posterior neural tube. However, its structure does not differ from the basic layout of the neural tube. It is a long, straight cord with a small, hollow space down the center. The neural tube is defined in terms of its anterior versus posterior portions, but it also has a dorsalventral dimension. As the neural tube separates from the rest of the ectoderm, the side closest to the surface is dorsal, and the deeper side is ventral. As the spinal cord develops, the cells making up the wall of the neural tube proliferate and differentiate into the neurons and glia of the spinal cord. The dorsal tissues will be associated with sensory functions, and the ventral tissues will be associated with motor functions. Q: The spinal cord develops, cells making up the wall of the neural tube proliferate and differentiate into what? Choices: - membrane and glia - muscles and glia - jelly and glia - neurons and glia A:
A: neurons and glia
Question: Answer the following question given this paragraph: The geometry of the BF 3 molecule is called trigonal planar . The fluorine atoms are positioned at the vertices of an equilateral triangle. The F-B-F angle is 120, and all four atoms lie in the same plane. Q: The geometry of the bf 3 molecule is called what? Choices: - fractal planar - spherical planar - distorted planar - trigonal planar A:
Answer: trigonal planar
*Question*
Answer the following question given this paragraph: Vertebrates have a closed circulatory system with a heart. Blood is completely contained within blood vessels that carry the blood throughout the body. The heart is divided into chambers that work together to pump blood. There are between two and four chambers in the vertebrate heart. With more chambers, there is more oxygen in the blood and more vigorous pumping action. Q: Leaves respond to these environmental stimuli by producing less what? Choices: - oxygen - carbonate - energy - chlorophyll A:
**Answer**
chlorophyll
Q: Answer the following question given this paragraph: Geology is the study of the solid Earth. Geologists study how rocks and minerals form. The way mountains rise up is part of geology. The way mountains erode away is another part. Geologists also study fossils and Earth's history. There are many other branches of geology. There is so much to know about our home planet that most geologists become specialists in one area. For example, a mineralogist studies minerals ( Figure below ). Q: What branch of science is the study of the solid earth? Choices: - palentology - ecology - biology - geology A:
A: geology