An index fossil must be?
a) older than 1 billion years.
b) smaller than other fossils around it.
c)larger than other fossils around it.
D) unique in its appearance.
pleases help someone i don't really know but my best guess is a)
my answer is incorrect it was D)
so is the wright answer D)?
An index fossil must be
A.
older than 1 billion years.
B.
unique in its appearance.
C.
larger than other fossils around it.
Which of the following is true about the age of rock layers and the age of the Earth?
A.
The Earth is older than any rock layer.
B.
The bottom layer in a sequence of rock layers is older than the Earth.
C.
The top layer in a sequence of rock layers is older than the Earth.
To determine the correct answer, we need to understand what an index fossil is. An index fossil is used by scientists to define and identify specific time periods in the Earth's history. Here's how you can figure out the correct answer:
a) Older than 1 billion years: This is not necessarily true for an index fossil. Index fossils can come from a wide range of time periods, depending on their significance.
b) Smaller than other fossils around it: The size of a fossil does not determine its potential as an index fossil. The significance of an index fossil lies in its ability to appear in rock layers specific to a particular time period, not in its size.
c) Larger than other fossils around it: Similar to the previous option, the size of a fossil is not relevant when determining its suitability as an index fossil.
d) Unique in its appearance: This is the most accurate choice. An index fossil must have distinct characteristics that can be easily recognized and attributed to a specific time period. Its uniqueness helps scientists identify and correlate the age of the rock layer in which it is found.
Therefore, the correct answer is d) unique in its appearance.