Answer:
A. different time periods
Explanation:
The contents of the layers are from different time periods based on the law of superposition of strata.
This law states that "in an undisturbed sequence of strata, the oldest layer can be found at the bottom and the youngest on top".
The rock layers and their contents are usually from different time periods. Most times biostratigraphic study of the strata would reveal the ages of the beds.
That the track or piece must be looped
<span>This organelle is the nucleolus.
The nucleolus is made of proteins, DNA, and RNA. They form around specific regions of the chromosomes called nucleolar organizing regions. These regions of the chromosomes contain some the genes needed for ribosome production.</span>
Individual codons code for specific amino acids. A gene is a sequence of nucleotides along a DNA strand - with 'start' and 'stop' codons and other regulatory elements - that specifies a sequence of amino acids that are linked together to form a protein. ... Each amino acid can be coded for by more than one codon.
Answer:
The first stage is the Interface.
Explanation:
There are primarily two main stages in a cell cycle; but the first stage is the interface. This is a stage in which a cell grows and also replicates its DNA.
It can be said to be the longest phase of the cell cycle. During this phase the cell growth reaches its maximum size, replicates its DNA, prepares for cell division, and also performs it very cellular functions.
This stage has three parts which include: G1, G2 and S phases.
Some cells do not need to divide to exit the cell cycle. These cells can exit the cell cycle permanently. Example is a neurons, they may also exit the cell cycle temporarily. These cells are said to be in G0 which is not a stage of the cell cycle.