16. Which of the following statements is/are correct?
A. The endoskeleton made of Chitin and protein in arthropods serves as a waterproof barrier and support for walking on land.
B. Given the following on the organism:
I. An animal
II. Multicellular
III. has tissues
IV. Has a circulatory system
V. has a hard exoskeleton and jointed appendages
This organism could be a member of the Phylum Insecta
C. Arthropods have a closed circulatory system
D. Arthropods can be found in all habitats of Earth
E. Insects are arthropods

Options A, B, D and E

Explanation:

Chitin and proteins which are major constituents of the exoskeleton of arthropods can act as waterproof barrier and also as a support for an arthropod. Organisms in the phylum Insects are animals, at multicellular, have tissues e.g. straighten muscle tissues adapter for movement. They also possess an open circulatory system, have a hard exoskeleton and joints appendages for movement. Arthropods have open circulatory system where blood rather hand been passed only in veins and arteries bathes all organs within the body. They are found everywhere and are arthropods.

Option A,B, D and E.

Explanation:

Phylum arthropods are the largest phylum of invertebrates in the animal kingdom. They have jointed appendages and open circulatory system.

They have exoskeleton I.e their body lack internal structures for supports. They have segmented bodies and they ate bilaterally symmetrical. Arthropods are found in every habitats. Chitin is the major constituent of arthropods endoskeleton and protein which serve as waterproof barrier while walking on land.

Examples of arthropods are insects, centipedes, millipedes, spiders, lobsters, mites, crabs e.t.c

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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