Question

The chart below shows an early embryonic stage of development for several different animal species. Based on the chart above, which of the following is most likely true?
A. The early embryonic stages of different species never share anatomical similarities with one another.
B. The early embryonic stages of many different animal species share anatomical similarities.
C. Embryos of all species are exactly alike until triggers from the environment stimulate their development into different species.
D. Characteristics of early embryonic development are always present in the adult form of the species.

Answer 1

The statement 'the early embryonic stages of many different animal species share anatomical similarities' is TRUE. These similarities are due to a common origin.

Similarities in embryo development

The similarities during the embryo stage of development among different animals are due to the expression of ancient genes.

These ancient genes have the same evolutionary origin, thereby they are homo-logous sequences.

For example, fish embryos and human embryos express certain homo-logous genes in the embryos stage, thereby leading to the development of gill slit during this stage.

Learn more about similarities in embryo development here:

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