A single point mutation<span> can change the whole DNA sequence. Changing one purine or pyrimidine may change the amino acid that the nucleotides code for.</span>Point mutations<span> may arise from spontaneous </span>mutations<span> that </span>occur<span> during DNA replication.</span>
A buildup of pesticides could get into an animal. That animal will be killed by a hunter. The hunter eats the animal with the pesticide. The hunter then becomes sick. This is just an example but you can see what i'm getting at.
This is not biology but i can probably help so get the surface area, then get the volume. and divide this is usually how ratios work, leave it a fraction, simplify if necessary
A plant cell has chloroplasts.
An animal cells doesn't.
