The crossing over mechanism of genetic variation results from the exchange of gene segments between non sister chromatids. The correct answer is A.
The changes in the fossils of a single organism over time will reveal (<span>B) how the species evolved.</span>
Answer:
The control group
Explanation:
The control group can be described as the group, which is being used to test any hypothesis or experiment, in which there are no changes made by a researcher. It serves as a platform to compare the other groups and the changes occurring in them. All the results from an experiment are deduced by comparing the changes from the control group. Thus, every experiment investigation has a control group.
Generally the order is for materials of a single molecule
Gasses are the least dense
Liquids are in between
Solids are the most dense
as evident if you pour sand in a cup of water, the least dense air (gas) will float on top, and the most dense sand (solid) will sink to the bottom.
However, there are some exceptions,
example, water
ice happens to less dense than water but it is a solid, the molecules of water happen to structure themselves in a way that makes them take up more space than water molecules following around each other
Well the energy comes from an external source. hope this helps thats all i know :)
