All eukaryotic organisms have cells with a nucleus surrounded my a membrane.
Answer:
A fixed allele is an allele that is the only variant that exists for that gene in all the population
Explanation:
Buffers absorb the free hydrogen ions and hydroxide ions that result from chemical reactions. Because they can bond these ions, they prevent increases or decreases in pH. An example of a buffer system is the bicarbonate system in the human body.
Explanation:
Any compound that has carbon atoms in its chemical formula is an organic compound.