<span>The nuclear envelope is a membrane that encloses a nucleus and separates it from the cytoplasm in eukaryotic cells. It is also known as the nuclear membrane. It is made up of two membranes - the inner membrane and the outer membrane. By separating the nucleus from the cytoplasm, DNA in the nucleus remains safe from the chemical reactions that occur in the cytoplasm.</span>
It's know as chemical equilibrium
FIshes have many cells, that is, they are multi cellular organisms. They are also eukaryotes, because their cells have true nucleus and they possess membrane bound organelle in their cells.
Fishes maintain homeostasis because it is the only means by which they can keep their internal environment constant. There are different types of fish, some live in salt water and some live in fresh water. Both type of fishes have to regulate their internal environments in order to maintain the biochemical reactions in their cells which sustain life.
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Keratinization is seen in the epidermis. Cells in the stratum corneum are essentially just bags of keratin.
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Different individuals within a species have variation because they may express
different alleles for the same traits