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The slide of stages in starfish development illustrates stages from unfertilized egg to gastrula—typical of echinoderms and chordates that have very little yolk in the egg. Three embryonic cell layers—ectoderm, endoderm, and mesoderm—are established. All adult tissues are derived from these layers.
The administration of prepared antibodies such as those in breast milk is an example of passive immunity.
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What is passive immunity?</h3>
when the prepared antibodies are directly given to protect the body against foreign agents is called passive immunity.
during the initial days of lactation, the yellowish fluid colostrum is secreted by the mother. it contains abundant IgA-prepared antibodies. during breast milk, it contains these antibodies that give immunity to the infant. it fights against the pathogen. these are an example of passive immunity.
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