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WorksheetsExplaining The Tree of Life
Total questions: 20
Worksheet time: 10mins
What was the origin of life in the sea around 3,000 million years ago?
Single-celled plants
Complex chemical molecules forming microscopic cells
Large aquatic animals
Fossilized bacteria
How did the first microscopic cells replicate?
Through mitosis
By budding
By splitting like bacteria
By fusion
What are modern descendants of the early chain-forming cells?
Fungi
Algae
Bacteria
Protozoa
The first multicellular organisms evolved into which present-day creatures?
Corals
Sponges
Mollusks
Fish
Which feature helped early mobile organisms process food?
A) A tail
B) A digestive cavity
C) A hard shell
D) Tentacles
What evolutionary advantage did some segmented creatures develop?
Internal skeletons
Hard protective skins
Bioluminescence
External gills
Around 450 million years ago, which creatures first ventured onto land?
Insects
Amphibians
Armored aquatic animals
Birds
How did some land creatures adapt to flying?
Developing hollow bones
Growing elongated flaps into wings
Forming lightweight exoskeletons
Learning to leap between trees
What evolutionary adaptation strengthened the internal rod of some marine creatures?
Muscles
Bone
Cartilage
Keratin
What evolutionary advantage did early fish gain?
Sharp teeth
A powerful tail
A hinged jaw
External lungs
How did some fish prepare for life on land?
Developing waterproof scales
Learning to breathe through their skin
Growing air-gulping ability and fleshy fins
Developing claws for gripping surfaces
What major limitation kept early amphibians close to water?
A) Their weak limbs
B) Their need to lay eggs in water
C) Their lack of lungs
D) Their inability to regulate body temperature
How did reptiles break their dependence on water?
By developing dry, scaly skin and watertight eggs
By forming lungs with greater capacity
By becoming nocturnal hunters
By living in underground burrows
Which modern animals are direct descendants of reptiles?
Amphibians
Mammals
Birds
Insects
What event led to the extinction of dinosaurs 65 million years ago?
A) A rapid ice age
B) A great disaster of unknown cause
C) The rise of mammals
D) Oxygen depletion in the atmosphere
What evolutionary trait helped birds survive the mass extinction?
Sharp claws
Flight and feathered bodies
Underground nesting behavior
Their ability to breathe underwater
What physical feature distinguished early mammals from other surviving creatures?
Large eyes
Warm, fur-covered bodies
Thick protective shells
Webbed feet
How did mammals take advantage of the post-extinction world?
By evolving into larger species
By becoming nocturnal hunters
By spreading to various environments
By preying on birds
What was one advantage of mammals being warm-blooded?
It allowed them to migrate long distances
It enabled them to be active day and night
It made them resistant to disease
It helped them grow faster
In which environments did mammals evolve after the extinction event?
Only in forests
In oceans, grasslands, forests, and mountains
Exclusively in the Arctic
Only on islands
