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
the shell of a crab
the shell of a crab
a dinosaur's backbone
a dinosaur's backbone
Which best supports the evidence that an asteroid collision may have caused caused the extinction of dinosaurs?(1 point)
Responses
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.
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.
Many dinosaur skeletons are found in one particular rock layer.
Many dinosaur skeletons are found in one particular rock layer.
Bodies of dinosaurs are only found in craters where asteroid collided.
In this case, the body of a jellyfish can be excluded due to the absence of fossil records.
To determine which option can be excluded due to the absence of fossil records, we need to understand the concept of fossilization. Fossilization occurs when the remains or traces of organisms are preserved in rock or sediment over long periods of time. The likelihood of an organism becoming a fossil depends on several factors, including its hard or durable parts, the conditions of the environment, and the presence of sedimentation.
Starting with the first option, "the shell of a snail," it is important to note that snails have shells made of calcium carbonate, which can be preserved as fossils under certain conditions. Snail shells are relatively common in the fossil record, so this option should not be excluded due to the absence of fossil records.
Moving on to the second option, "the body of a jellyfish," jellyfish are soft-bodied organisms that do not possess hard or durable parts. Soft-bodied organisms, like jellyfish, have a low preservation potential because their bodies easily decompose and are unlikely to leave fossil traces. Therefore, the body of a jellyfish can be excluded due to the absence of fossil records.
The third option is "the shell of a crab." Similar to snails, crabs have hard shells that can be preserved as fossils, depending on the conditions. Crab shells are also relatively common in the fossil record, so this option should not be excluded due to the absence of fossil records.
Lastly, we have "a dinosaur's backbone." Dinosaurs were ancient reptiles with bones that could fossilize under favorable conditions. Dinosaur fossils, including backbones, have been discovered and extensively studied, so this option should not be excluded due to the absence of fossil records.
Based on this analysis, the option that can be excluded due to the absence of fossil records is the body of a jellyfish.