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Misti C.
Cameron University Graduate
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Environmental Science
TutorMe
Question:

What are some drawbacks to green energy sources, such as wind turbines and solar panels?

Misti C.
Answer:

While there are significant benefits to moving away from fossil fuels and towards green energy, there are also some drawbacks. The process of making solar panels is costly in terms of chemical waste from the materials used to make the photovoltaic cells and the batteries that store the energy produced by the panels. The windmill is less chemical-intensive but requires the shaping of steel, which consumes fuel during the smelting process. Once installed there are also drawbacks to both the wind turbines and the solar panels. Solar panels can raise temperatures in the air above them, and if focused just right they can kill birds that fly through their path. Some of the best places to put wind turbines coincide with strictly prairie dwelling creatures, like the Greater Prairie Chicken, which is actually frightened of tall structures and dislike nesting within 8km of any tall structure. In addition wind turbines have been known to kill bats and birds that fly through the areas either hunting or during migrations.

Biology
TutorMe
Question:

What are the five mechanisms of Darwinian evolution? Please list, define, and explain the importance of each.

Misti C.
Answer:

Mutation: the random creation of new alleles within a population. Mutations create the pool of available alleles in a population, without mutation there is no evolution. Gene Flow: the movement of alleles between two or more populations. Gene flow is the exchange of alleles between populations, this can introduce new alleles, stabilize the frequencies already found in the populations involved, or even destabilize one of the population's allelic frequencies depending on what alleles are moving and how many. Genetic Drift: the change in frequency of alleles in a population due to random chance alone. The best example of genetic drift is a population that has experienced a natural disaster, like a fire, that wiped out one of the alleles previously present in that population. The allele had no effect on fitness to survive the fire, it just happened to be present in the individuals lost to the disaster. This loss of one of the alleles is an example of how random events can shape the evolution of a population. Natural Selection: the change in frequency of alleles in a population due to a population's environment. Natural selection is best illustrated by the Galapagos Finches. Each beak phenotype present in the fifteen species is the direct result of natural selection of phenotypes suited their available food source. Sexual Selection: the change in frequency of alleles in a population due to nonrandom mating. Sexual selection is important because it accounts for the selection of mates based on characters that aren't necessarily the fittest for the current environment, but rather what the other sex finds attractive in that particular species.

Algebra
TutorMe
Question:

Please factor the following equation: x^2+6x-16.

Misti C.
Answer:

Factoring is just Foiling in reverse. First, we list all the number combinations that would result in each term within the equation starting with x^2 x^2 (x,x) this term only has one possible combination that would result in x^2 when multiplied together. -16 (-1,16)(1,-16)(-2,8)(2,-8)(-4,4)(4,-4) we know one number from each pair has to be negative but we don't know which one, so we list each combination with a different negative number. +6x (-2,8) The last term combination isn't multiplied but added together. We use this term to narrow down the choices we listed for -16 to the only combination that results in -16 when multiplied AND +6 when added. Here is the answer when we put it all together : (x-2)*(x+8) To check our work we just foil the answer and see if we get the original equation of x^2+6x-16.

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