Question

question 1 (multiple choice worth 4 points)
(05.04 mc)
in the early 1700s linnaeus came up with a new system of classification of living things that eventually replaced the one that had been used since aristotle developed it in ancient greece about 2000 years earlier. why was a change necessary?
a new system was needed to include the new species that had evolved since the original classification system was developed.
so many new species were being discovered, it was impossible to arrange them all in a hierarchy based on relative complexity of species.
a system based on differences in physical characteristics was no longer sufficient to describe all that was known about living things.
there was no way in aristotles system to classify the microscopic organisms discovered after the development of the microscope.

question 2 (multiple choice worth 4 points)
(05.01 mc)
short - spined sea urchin fossils were found directly above long - spined sea urchin fossils in a layer of rock. what do the differences between the two sets of sea urchin fossils suggest about them?
the longer spines developed as the shorter - spined sea urchins grew older.
the longer - spined sea urchins existed before the shorter - spined sea urchins.
the shorter - spined sea urchins stretched their spines to ward off predators.
the shorter spines did not protect the sea urchins well enough and they died off.

Explanation:

Question 1

• Option A: Species don't "evolve" to be added to a classification system; classification is about organizing known life, so A is incorrect.
• Option B: Linnaeus's system was hierarchical, and the issue wasn't arranging by complexity but describing life, so B is incorrect.
• Option C: Aristotle's system was based on physical traits, but as knowledge of life (like microscopic organisms, new anatomical/physiological info) grew, physical traits alone weren't enough. Linnaeus's system (binomial nomenclature, more detailed classification) addressed this, so C is correct.
• Option D: Microscopic organisms were part of the broader need for a better system, but the main issue was the insufficiency of physical - trait - based classification for all known life, not just microscopic ones, so D is incorrect.

• Option A: Spine length isn't a result of aging in this context; fossil layers show temporal order, not individual growth, so A is incorrect.
• Option B: In rock layers, the lower layer is older. So long - spined fossils are in the lower layer (older) and short - spined in the upper (younger), meaning long - spined existed before short - spined, so B is correct.
• Option C: Stretching spines isn't a biological process that would be preserved in fossils, and the question is about fossil layers (temporal order), not adaptation, so C is incorrect.
• Option D: The fossil layers show the order of existence, not about survival due to spine protection (though that could be a factor, the main inference from layers is temporal order), so D is incorrect.

Answer:

C. A system based on differences in physical characteristics was no longer sufficient to describe all that was known about living things.

Question 2