Answer:
B, A fossil found in rocks from one time period
Explanation:
Fossils are used to determine the ages of rock layers. Index fossils are the most useful for this. Index fossils are of organisms that lived over a wide area. They lived for a fairly short period of time. An index fossil allows a scientist to determine the age of the rock it is in. Hope that this helps you :)
The main difference between haploid and diploid cells is the number of chromosome sets found in the nucleus. Diploid cells have two sets while haploid cells only contain one set.
Cancer cells differ from other cells because Cancer cells spread at a different rate sometimes even slower. Destroying cells in it's path.
Answer:
Motor neurons stimulate muscles to contract answer:C
A person with this genetic disorder has an extra x-chromosome. Their genotype is XXY.
