The body of a jellyfish can be excluded due to the absence of fossil records. Jellyfish have a soft body that does not easily fossilize, making it difficult to find fossil evidence of them compared to other organisms with hard parts, such as the shells of snails or crabs and the bones of dinosaurs.
Which can be excluded due to the absence of fossil records? (1 point)
the shell of a snail
the body of a jellyfish
the shell of a crab
a dinosaur's backbone
7 answers
Which best supports the evidence that an asteroid collision may have caused the extinction of dinosaurs? (1 point)
• Dinosaur fossil remains are found at the bottom of a body of water.
Rare metal on Earth called Iridium is found in layers where dinosaurs disappeared.
• Bodies of dinosaurs are only found in craters where asteroid collided.
• Many dinosaur skeletons are found in one particular rock layer.
• Dinosaur fossil remains are found at the bottom of a body of water.
Rare metal on Earth called Iridium is found in layers where dinosaurs disappeared.
• Bodies of dinosaurs are only found in craters where asteroid collided.
• Many dinosaur skeletons are found in one particular rock layer.
The statement 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."
The discovery of a layer of iridium-rich clay in the geological record coinciding with the time of the dinosaurs' extinction supports the hypothesis of an asteroid impact, as iridium is more common in asteroids than in the Earth's crust.
Which is correct about fossils location and age? (1 point)
• Fossils found in rock layers that have been disturbed are the oldest.
• Fossils found in rock layers closest to Earth's surface are the oldest.
• 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.
• Fossils found in rock layers that have been disturbed are the oldest.
• Fossils found in rock layers closest to Earth's surface are the oldest.
• 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."
In general, the principle of superposition states that in undisturbed sedimentary rock layers, older layers of rock are located beneath younger layers. Therefore, fossils found in lower rock layers are typically older than those found in higher layers.
Why are time periods on the geologic time scale not even in length?
(1 point)
• They are based on a different type of calendar used to track Earth's history.
• 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 the thickness of the Earth's rock layers.
(1 point)
• They are based on a different type of calendar used to track Earth's history.
• 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 the thickness of the Earth's rock layers.
The correct answer is: "They are based on important events that happened in Earth's history."
The geologic time scale is divided into different periods, eras, and epochs, which are based on significant geological and biological events, such as mass extinctions, climate changes, and the emergence of new life forms. As a result, the lengths of these time periods are not uniform.
1 answer