AnswersSY2025-26 - 2002070 MJ Comprehensive Science 2 Sem 1 CRUnit Test

Living Things and the Environment Answers

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21
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The diagram shows a football field that represents a geological time scale.Why are no organisms labeled between the end zone and 30 yard line on the left side of the field?

Question illustration
A
Scientists disagree about the fossils from this time period.
B
Scientists have not studied that part of the time scale.
C
There is very little fossil evidence for this time period.
D
There are too many fossils to name.
22
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Alex listed the typical steps of fossil formation.1) An organism dies.2) The remains fall to the bottom of the ocean.3) The soft portions decay, and the hard portions remain.4) The sediment becomes rock.

A
After step 3, layers of sediment cover the dead organism.
B
After step 1, minerals dissolve the dead organism.
C
After step 4, layers of sediment cover the dead organism.
D
After step 2, minerals dissolve the dead organism.
23

Suppose a species of snake is living in a certain area. Some of the snakes in the population are black and some are orange. Over time, the area changes and the orange snakes have a harder time blending in with the environment. This makes it difficult for the orange snakes to catch food.According to Darwin’s theory of evolution, what will most likely happen to this snake population over time?

A
Most orange snakes will survive and reproduce, passing on their traits to their offspring. Few black snakes will remain in the population.
B
Most black snakes will survive and reproduce, passing on their traits to their offspring. The number of orange snakes in the population will not change.
C
The black snakes will survive and reproduce, passing on their traits to their offspring. Few orange snakes will remain in the population.
D
Most orange snakes will survive and reproduce, passing on their traits to their offspring. The number of black snakes in the population will not change.
24

Which best describes Darwin’s studies that led to the theory of evolution?

A
extensive research of an individual organism within a short period
B
extensive research of an individual organism over many years
C
observations and data collected within a short period
D
observations and data collected over many years
25

Which causes genetic variations and can result in different alleles?

A
predation rate
B
random mutations
C
competition
D
environmental changes

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