Biology JLAB Exam Questions and
Answers 100% Pass
Ascidians are sac-like marine organisms. Their larvae have well-developed brains and
dorsal nerve cords. This suggests that ascidians should be classified with the - -
✔✔chordates
In order to maintain homeostasis, it is most important for an animal to be able to - -
✔✔respond to its environment
A scientist develops a hypothesis, designs an experiment, and obtains data that support
her hypothesis. Which of the following best describes when a hypothesis becomes a
theory? - ✔✔When it is supported by consistent data from many experimental trials
Which of these is a decomposer in a Virginia forest? - ✔✔a mushroom
According to the classification key, what is the genus and species of this organism? -
✔✔Eurytides marcellus
A population of mice is evenly divided into two groups, and each group is placed on an
isolated island with no existing mouse population. Which statement best explains the
difference in the mouse populations on Island A and Island B at the end of the 20 years?
- ✔✔Conditions on Island B favored the brown-furred individuals,
while both fur colors were evenly advantaged on Island A.
Lamarck was an early scientist who
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, studied the development of characteristics in
organisms over time. Which of the following
choices best describes his views on how
organisms change over time? - ✔✔Theory of acquired characteristics
A certain virus causes a disease of the
digestive system. What is the most likely source of
this virus? - ✔✔water
Based on this classification scheme, the European otter and the leopard are in
the same — - ✔✔order but different families
Which area of the leaf is most
responsible for protecting the leaf from the
drying effects of the air? - ✔✔the cuticle
According to the data in the graph,
during which time period did the overall bluegill
population decline? - ✔✔1996-1999
The picture shows the trachea and
surrounding tissue of a flea. Which of these
best describes the shape of the flea trachea? - ✔✔a long, branched tube
The organisms at the beginning of the food chain are - - ✔✔producers
© EMILY CHARLENE YEAR 2025-2026, ALL RIGHTS RESERVED 2
Answers 100% Pass
Ascidians are sac-like marine organisms. Their larvae have well-developed brains and
dorsal nerve cords. This suggests that ascidians should be classified with the - -
✔✔chordates
In order to maintain homeostasis, it is most important for an animal to be able to - -
✔✔respond to its environment
A scientist develops a hypothesis, designs an experiment, and obtains data that support
her hypothesis. Which of the following best describes when a hypothesis becomes a
theory? - ✔✔When it is supported by consistent data from many experimental trials
Which of these is a decomposer in a Virginia forest? - ✔✔a mushroom
According to the classification key, what is the genus and species of this organism? -
✔✔Eurytides marcellus
A population of mice is evenly divided into two groups, and each group is placed on an
isolated island with no existing mouse population. Which statement best explains the
difference in the mouse populations on Island A and Island B at the end of the 20 years?
- ✔✔Conditions on Island B favored the brown-furred individuals,
while both fur colors were evenly advantaged on Island A.
Lamarck was an early scientist who
© EMILY CHARLENE YEAR 2025-2026, ALL RIGHTS RESERVED 1
, studied the development of characteristics in
organisms over time. Which of the following
choices best describes his views on how
organisms change over time? - ✔✔Theory of acquired characteristics
A certain virus causes a disease of the
digestive system. What is the most likely source of
this virus? - ✔✔water
Based on this classification scheme, the European otter and the leopard are in
the same — - ✔✔order but different families
Which area of the leaf is most
responsible for protecting the leaf from the
drying effects of the air? - ✔✔the cuticle
According to the data in the graph,
during which time period did the overall bluegill
population decline? - ✔✔1996-1999
The picture shows the trachea and
surrounding tissue of a flea. Which of these
best describes the shape of the flea trachea? - ✔✔a long, branched tube
The organisms at the beginning of the food chain are - - ✔✔producers
© EMILY CHARLENE YEAR 2025-2026, ALL RIGHTS RESERVED 2
