Bio 200 UB Exam Questions with
Complete Solutions
What did the first multicellular organisms look like? - ANSWER-Soft bodies,
no hard shells
some capable of movement (which was new)
What happened in the paleozoic era? (organisms) - ANSWER--many hard shelled &
more easily fossilified organisms
-large & relatively sophisticated animals
Trilobites
arose-
looked like- - ANSWER-Arose in paleozoic era **and only in paleozoic era during
cambrien period
Hard-shelled animals that came right at the begining of the paleozoic era and where
very common
Archeocyathids - ANSWER-Various cambrien sponge-like animals
**very common in paleozoic era but died out in paleozoic era towards end
When did the Cambrian explosion occur? - ANSWER-During the paleozoic era
What is the problem with the Cambrian explosion? - ANSWER-There are
precambrian animals & the 'explosion' didn't happen as rapid as we once believed
1st land plants occurred during the --- - ANSWER-Occurred during the paleozoic era
(ex: carpet moss)
1st land animals occurred during the ---
transitioned from --- to ---
dominated by --- - ANSWER-paleozoic era (ex: amphibian tetrapod)
**transition from fish --> land occured
***dominated by amphibians
The paleozoic era ends with the -- - ANSWER-permian extinction
Permian extinction - ANSWER-great dying
, 96% of all life went extinct
& 70% of terestrial vertibrates go extinct
(crazy decrease in animals--lot's of room for growth)
After Paleozoic era comes the - ANSWER-Mesozoic era
the mesozoic era is known as - ANSWER-the Age of reptiles (before rise of
dinosaurs)
When did the 1st mammals come? - ANSWER-During the mesozoic era (ex:
morganucodon Watsoni)
The mesozoic era ends with the - ANSWER-K-T extinction event
K-T extinction event - ANSWER-Mesozoic era ends with this
mass extinction of animals & plants species in a geologically short period of time
K-T boundary - ANSWER-Tin band of sedimentation that can find in various parts of
the world
This is caused by catostrophic events. Non-avion dinasour fossils can only be found
below boundry bc extinct before or during time.
explain more K-T boundry - ANSWER-1 or more catostophic events such as astroid
impact, increase volcanic activity, geological events led to enough dust & ash in the
atmosphere which
reduced sunlight
which hindered photosynthesis
which led to massive disruptions in earths ecology
What comes after the Mesozoic era? - ANSWER-The Cenozoic era
the cenozoic era is kwon as the - ANSWER-Age of mammals
(-now)
**first humans appeared
Has the earth changed over time? and why? - ANSWER-yes
Land masses move due to continential drift, climate change, oxygen levels changing,
structural and diversity of life changes
Geological clock - ANSWER-**helps us visualize the passage of time
Complete Solutions
What did the first multicellular organisms look like? - ANSWER-Soft bodies,
no hard shells
some capable of movement (which was new)
What happened in the paleozoic era? (organisms) - ANSWER--many hard shelled &
more easily fossilified organisms
-large & relatively sophisticated animals
Trilobites
arose-
looked like- - ANSWER-Arose in paleozoic era **and only in paleozoic era during
cambrien period
Hard-shelled animals that came right at the begining of the paleozoic era and where
very common
Archeocyathids - ANSWER-Various cambrien sponge-like animals
**very common in paleozoic era but died out in paleozoic era towards end
When did the Cambrian explosion occur? - ANSWER-During the paleozoic era
What is the problem with the Cambrian explosion? - ANSWER-There are
precambrian animals & the 'explosion' didn't happen as rapid as we once believed
1st land plants occurred during the --- - ANSWER-Occurred during the paleozoic era
(ex: carpet moss)
1st land animals occurred during the ---
transitioned from --- to ---
dominated by --- - ANSWER-paleozoic era (ex: amphibian tetrapod)
**transition from fish --> land occured
***dominated by amphibians
The paleozoic era ends with the -- - ANSWER-permian extinction
Permian extinction - ANSWER-great dying
, 96% of all life went extinct
& 70% of terestrial vertibrates go extinct
(crazy decrease in animals--lot's of room for growth)
After Paleozoic era comes the - ANSWER-Mesozoic era
the mesozoic era is known as - ANSWER-the Age of reptiles (before rise of
dinosaurs)
When did the 1st mammals come? - ANSWER-During the mesozoic era (ex:
morganucodon Watsoni)
The mesozoic era ends with the - ANSWER-K-T extinction event
K-T extinction event - ANSWER-Mesozoic era ends with this
mass extinction of animals & plants species in a geologically short period of time
K-T boundary - ANSWER-Tin band of sedimentation that can find in various parts of
the world
This is caused by catostrophic events. Non-avion dinasour fossils can only be found
below boundry bc extinct before or during time.
explain more K-T boundry - ANSWER-1 or more catostophic events such as astroid
impact, increase volcanic activity, geological events led to enough dust & ash in the
atmosphere which
reduced sunlight
which hindered photosynthesis
which led to massive disruptions in earths ecology
What comes after the Mesozoic era? - ANSWER-The Cenozoic era
the cenozoic era is kwon as the - ANSWER-Age of mammals
(-now)
**first humans appeared
Has the earth changed over time? and why? - ANSWER-yes
Land masses move due to continential drift, climate change, oxygen levels changing,
structural and diversity of life changes
Geological clock - ANSWER-**helps us visualize the passage of time
