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WorksheetsUnit 6 Review
Total questions: 25
Worksheet time: 27mins
The most common Precambrian fossils are ________, layered mounds of calcium carbonate.
prokaryotes
chert
trilobites
eukaryotes
stromatolites
Scientists have found evidence that life existed at least 3.5 billion years ago ________.
in northern Siberia
on the Gulf Coast
throughout North and South America
in Kenya
in several locations around the world
Which type of bacteria thrive in environments that lack free oxygen?
aerobic
placental
anaerobic
foraminifera
photosynthetic
Where do scientist believe the first life developed?
On land
On the surface of the oceans
In Glaciers
Deep in the Ocean
What type of organism was the first to develop?
heterotroph
Photosynthetic Autotroph
Chemoautoroph
Eukaryotic cell
The Endosymbiotic Theory explains
the origin of prokaryotes
how bacteria lives
the origin of eukaryotes
how species develop
Bacteria are an example of a ____ cell.
prokaryotic
eukaryotic
plant
animal
_____ and _____ are organelles that arose from endosymbiosis
nucleus and cell membrane
mitochondria and chloroplasts
cell wall and chloroplasts
mitochondria and nucleus
Which of the following is evidence to support the endosymbiotic theory?
Mitochondria and chloroplasts have their own DNA, which is similar to prokaryotic DNA.
Fossil evidence shows that the first forms of life were prokaryotic cells.
All eukaryotic cells have a double-layered membrane composed of phosplipids and proteins.
Prokaryotes have the same number and types of enzymes as eukaryotes.
Species that cannot adapt to environmental changes can become?
adaptations
extinct
shells
size
During the Cambrian Explosion, life forms generally were greater in ?
adaptations
extinct
shells
size
Characteristics that help a species survive in it's environment are ?
adaptations
extinct
shells
size
Which fossil is the youngest?
fossil A
fossil B
fossil C
fossils A and B are the same age
What period is characterized by an explosion of adaptaions that are now seen in modern day animals
Jurrasic
Cambrian
Pre-Cambrian
Cenozoic
Which of the following evolved during the Cambrian Explosion
DNA
Digestive System
Shells
Nervous System
Colonial Lifeforms
Which trait was selected for in Tiktaalik which led to the evolution of tetrapods?
Fins so it could swim in water
Four limbs so it could walk on land
Lungs so it could breathe air
Which extinction is considered the largest mass extinction in Earth's history? Basically 96% of all species on Earth disappeared.
Ordovician Extinction
Devonian Extinction
Permian Extinction
Triassic Extinction
Cretaceous Extinction
According to most scientists, what is the ultimate cause of most mass extinctions?
overhunting
evolution of new species to replace old ones
major change in environment or climate
asteroid impact
True or False: Human beings are wiping out species much faster than nature creates them, causing what scientists call a "6th extinction"
true
false
The dinosaurs went extinct in the __________ Mass extinction
Cretaceous-Tertiary (KT)
Triassic Jurassic
Ordovician-Silurian
None of the options
Which of the following is NOT an explanation as to why the dinosaurs went extinction?
Volcanic eruption
Meteorite strike
Massive earthquakes
All of the options explain why dinosaurs went extinct
