In stage 3, a different structure like forelimbs, their sizes as well as eyes begin to appear.
Further Explanation:
An embryo refers to the early phase of development in organisms. They involve stages like blastula, gastrula, and finally, organogenesis. The embryo of salamanders, lizards, humans, cats, and birds are similar during the first phase of their embryonic growth and have many homologous structures that are not found when the organisms are adults.
As the embryonic development progresses, one can see distinguishable features of the embryo, which segregates a cat from a human. These features include forelimbs, eyes, nose, and many more. The distinguishable features make every organism different; thus, we can go ahead and classify or identify organisms based on the various developmental stages it shows.
The progressing developmental stage ensures that the organism develops and matures into a fully developed individual. The proper nutrition and other condition required during the developmental stages is needed to make sure an appropriate and well-needed growth occurs.
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Answer Details:
Grade: Middle School
Subject: Biology
Chapter: Developmental Biology
Keywords:
Embryonic development, forelimbs, eyes, human, cat, embryo, blastula, gastrula, organogenesis.