1. plants and animals play major roles in cycling materials in ecosystems. the diagram below represents one particular cycle. letters w and y represent different processes. letters x and z represent different gasses. what reaction below represents the process going on at "w"? a. 6co2 + 6h2o → c6h12o6 + 6o2 b. c6h12o6 + 6o2 → 6co2 + 6h2o c. ca + 2hcl –> cacl2 + h2 d. cacl2 + h2 –> ca + 2hcl 2. which of these relationships is the best example of competition? use the food web to answer question 3. a. toad and rabbits b. hawk and toad c. grasshopper and plant d. sparrow and toad 3. what is likely to happen if the grasshopper population decreases? a. decrease in the producers and the secondary consumers b. an increase in the producers and the secondary consumers c. an increase in the producers and a decrease in the secondary consumers d. an decrease in the producers and an increase in the secondary consumers 4. what does this enzyme temperature graph tell you about the environment in which this enzyme functions? a. its optimum temperature is 20 degrees celsius b. its optimum temperature is 30 degrees celsius c. its optimum temperature is 35 degrees celsius d. its optimum temperature is 40 degrees celsius

Answer 1:

The correct option is A. 6CO2 + 6H2O → C6H12O6 + 6O2

Explanation

The letter W depicts the mechanism of photosynthesis taking place. As a result of photosynthesis, glucose and oxygen will be made. The Oxygen will then be released and taken up by the animal during the process of respiration.

Answer 2:

The correct option is D.  

Explanation

The animals that show competition are sparrows and toad. As we can see from the diagram of the food web, sparrow and toad are main competitors in the food chain. Competition is a mechanism in food web in which two organisms compete for resources in a habitat. They usually have the same enemies and same food sources to feed on. As in the diagram, sparrow and toad have the same enemy i.e hawk and same food source i.e grasshopper.

Answer 3:

The correct option is C. An increase in the producers and a decrease in the secondary consumers

Explanation:

Grasshoppers are the primary consumers in the given food web. A decrease in the population of grasshoppers will lead to an increase in the population of the producers. This is because there will be less consumers to feed on the plants. Sparrow and toad are the secondary consumers according to the diagram. As they feed on the grasshoppers, a decline in the population of grasshoppers will also lead to a decline in the population of sparrow and toad. As they will have limited amount of food and will have to under go severe competition for food.

Answer 4:

The correct option is D. Its optimum temperature is 40 degrees Celsius.

Explanation:

Optimum temperature can be described as the temperature at which the activity of the enzyme is fastest. Different enzymes have different optimum temperatures. The graph in the figure shows that the activity of purified phosphatase enzyme was maximum at 40 degrees Celsius. Hence, this temperature is the optimum temperature for this enzyme.

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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it’s lava came from an explosive eruption