<span>Some animals and plants are only known to us as fossils. By studying the fossil record we can tell how long life has existed on Earth, and how different plants and animals are related to each other.
Dats the answer^^^</span>
The answer should be A- chromosome. chromosome determine all your traits including if you are female or male. it also determine any illness or defect that might occur
<span>a change in observations that challenge existing knowledge</span>
Answer:
A gene is an order of nucleotides in DNA or RNA that encodes the structure of a gene product, either RNA or protein. During gene expression, the DNA is copied into RNA. The RNA can be directly functional or be the standard template for a protein that performs a function.
Explanation:
Shout out to Wikipedia.