The body of a jellyfish can be excluded due to the absence of fossil records. Jellyfish have soft bodies that do not fossilize well, whereas the shells of snails, crabs, and the bones of dinosaurs are more likely to leave behind fossil evidence.
Which can be excluded due to the absence of fossil records?(1 point)
Responses
the shell of a snail
the shell of a snail
the body of a jellyfish
the body of a jellyfish
a dinosaur's backbone
a dinosaur's backbone
the shell of a crab
the shell of a crab
7 answers
Which best supports the evidence that an asteroid collision may have caused the extinction of dinosaurs?(1 point)
Responses
Dinosaur fossil remains are found at the bottom of a body of water.
Dinosaur fossil remains are found at the bottom of a body of water.
Bodies of dinosaurs are only found in craters where asteroid collided.
Bodies of dinosaurs are only found in craters where asteroid collided.
Rare metal on Earth called Iridium is found in layers where dinosaurs disappeared.
Rare metal on Earth called Iridium is found in layers where dinosaurs disappeared.
Many dinosaur skeletons are found in one particular rock layer.
Many dinosaur skeletons are found in one particular rock layer.
Responses
Dinosaur fossil remains are found at the bottom of a body of water.
Dinosaur fossil remains are found at the bottom of a body of water.
Bodies of dinosaurs are only found in craters where asteroid collided.
Bodies of dinosaurs are only found in craters where asteroid collided.
Rare metal on Earth called Iridium is found in layers where dinosaurs disappeared.
Rare metal on Earth called Iridium is found in layers where dinosaurs disappeared.
Many dinosaur skeletons are found in one particular rock layer.
Many dinosaur skeletons are found in one particular rock layer.
The response that best supports the evidence that an asteroid collision may have caused the extinction of dinosaurs is:
Rare metal on Earth called Iridium is found in layers where dinosaurs disappeared.
This evidence is significant because iridium is more abundant in asteroids than on Earth, and its presence in the geological layer corresponding to the time of the dinosaurs' extinction supports the hypothesis of an asteroid impact.
Which is correct about fossils location and age?(1 point)
Responses
Fossils found in rock layers closest to Earth’s surface are the oldest.
Fossils found in rock layers closest to Earth’s surface are the oldest.
Fossils found in rock layers that have been disturbed are the oldest.
Fossils found in rock layers that have been disturbed are the oldest.
Fossils found in among numerous other fossils are most recent in age.
Fossils found in among numerous other fossils are most recent in age.
Fossils found in lower rock layers are older than fossils found in upper layers.
Responses
Fossils found in rock layers closest to Earth’s surface are the oldest.
Fossils found in rock layers closest to Earth’s surface are the oldest.
Fossils found in rock layers that have been disturbed are the oldest.
Fossils found in rock layers that have been disturbed are the oldest.
Fossils found in among numerous other fossils are most recent in age.
Fossils found in among numerous other fossils are most recent in age.
Fossils found in lower rock layers are older than fossils found in upper layers.
The correct statement about fossils' location and age is:
Fossils found in lower rock layers are older than fossils found in upper layers.
This principle is known as the law of superposition, which states that in undisturbed sedimentary rock layers, older layers are found beneath younger layers.
Why are time periods on the geologic time scale not even in length?(1 point)
Responses
They are based on the type of fossils found in rock layers of the Earth.
They are based on the type of fossils found in rock layers of the Earth.
They are based on important events that happened in Earth’s history.
They are based on important events that happened in Earth’s history.
They are based on the thickness of the Earth's rock layers.
They are based on the thickness of the Earth's rock layers.
They are based on a different type of calendar used to track Earth’s history.
Responses
They are based on the type of fossils found in rock layers of the Earth.
They are based on the type of fossils found in rock layers of the Earth.
They are based on important events that happened in Earth’s history.
They are based on important events that happened in Earth’s history.
They are based on the thickness of the Earth's rock layers.
They are based on the thickness of the Earth's rock layers.
They are based on a different type of calendar used to track Earth’s history.
The correct response is:
They are based on important events that happened in Earth’s history.
The divisions in the geologic time scale are not uniform because they are determined by significant geological and biological events, such as mass extinctions or major evolutionary developments, rather than by a consistent length of time.