97 points | define antigen and antibody and explain why they create reactions between blood types.

An antigen is any substance unnatural (not natural to your blood cells) that enters your body triggering the production of antibodies.

An antibody is a protein found in the blood that is produced in order to "fight" antigens.

And this is how they create reactions between blood types: the self-antigens (natural antigens found in your blood cells) are not the same that is found in another blood type (since blood types are defined by the antibodies and antigens encountered). So, when a different blood type enters your body (obviously carrying different antigens), your antibodies will respond.

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name and explain one of the event that occurs during meiosis that increases the variation in offspring even more than simple reproduction?

label a cell membrane

label b cytoplasm

label c ribosomes

label d dna

the membrane forms the outside of the cell

cytoplasm is the liquid within

ribosomes are the components within that distribute rna

the dna is the genetic make-up