11. what is the purpose of natural selection?

to limit the genetic variation of a population
to increase the frequency of desired alleles in a population
to keep life going even as the environment changes

12. which is an example of artificial selection?

a farmer crosses two kinds of corn. he produces a new, better tasting type of corn.
a flood drowns most of the lizards in an area. only lizards that can swim live to reproduce.
two male wild turkeys fight. the weaker one is killed. the winner mates with all the females.

13. a fossil found under a layer of rock is usually

evolved from the rock
younger than the rock
older than the rock
made from a different type of rock

14. what is the creation of new combinations of alleles called?

gene flow
genetic drift
recombination
mutation

15. which evolutionary mechanism caused the increase in dark-colored biston betularia moths in england in the 1800s?

gene flow
genetic drift
natural selection
overproduction

16. natural selection is based on darwin’s observation that individuals most likely to survive and reproduce are those

with many offspring that have similar traits
with traits best suited to their current environment
that descended from previous life forms
that do not resemble their ancestors

17. at one time, dinosaurs lived on earth. today they are extinct. this relates to

both macroevolution and microevolution
microevolution
macroevolution

18. an orphaned female lion joins a band of lions. the addition of her genes to their gene pool is

natural selection
recombination
genetic drift
gene flow

19. which is an example of a population?

all the squirrels in north america and europe
all the rose bushes around the world
all the sugar maple trees in a state park
all the species of organisms in one state

20. which of the following explains darwin’s theory of natural selection?

individuals in a population with traits best suited for that environment survive and increase in number.
more recent species of organisms are changed descendants of earlier species.
present organisms are related to and descended from past organisms.

#11. to keep life going even as the environment changes

why many students visually perceive stem as a vapid class?

for many students, however, stem subjects are optically discerned as vapid, tedious, and destitute of authentic-world applications. science and math have always been a major part of the high school curriculum, but many students have disengaged from these subjects because they don’t optically discern that they have any pertinence to the authentic world or students’ daily lives. for them, math and science have become a set of rules, procedures, laws, theorems, and formulas to memorize. some students even develop math apprehensiveness and cerebrate they are incapable of learning higher-level mathematics.

why is stem paramount?

as the u.s. economy changes, the ordinant dictation for stem-capable workers is growing. in may of 2014, the u.s. bureau of labor statistics counted more than 8.3 million stem jobs, which accounted for 6.2 percent of total employment in the cumulated states. that number is expected to perpetuate to increment as u.s. companies grow and innovate to compete in the ecumenical economy. according to the u.s. department of labor, the average salary for all stem jobs is $85,570, which is virtually double the average salary for all jobs.

many people still envision stem professionals as wearing a white lab coat and conducting research in a laboratory. in authenticity, some of the most in-demand stem fields are petroleum engineering, process engineering, and computer engineering. these fields that are experiencing shortages of qualified candidates are additionally among the highest paying, with the average petroleum engineer earning an annual salary of $147,520 in may 2014 according to the u.s. bureau of labor statistics.

in additament, stem subjects edify students valuable skills that are vital for prosperity in all vocations, even those that do not directly require stem erudition. engagement in stem subjects avails students develop quandary-solving, critical mentally conceiving, and leadership skills. these skills are so ecumenical, in fact, that statistics relinquished in the summer of 2013 by the u.s. census bureau designated that about three-quarters of the people with a bachelor’s degree in stem fields are not working in those vocations. many non-stem employers are poaching stem-qualified job candidates because they are more ingenious and collaborative than their non-stem counterparts.

as the ecumenical economy perpetuates to evolve, the desideratum for stem-capable workers will perpetuate to grow. by getting edifiers and students involved in the stem kineticism, an incipient generation of adroit workers will be poised to energize and expand this exhilarating field.

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