Question

a diagram shows embryo developed of four different animals. how is this evidence used to suggest that life changes over time?

Answer 1

In the early stages the embryos of four different species will look the same .For example, fish embryos and human embryos both have gill slits. In fish they develop into gills, but in humans they disappear before birth. That what makes them different.

Answer 2

Answer:

    Comparing embryos of different species, we observed a great similarity in the early stages of embryonic development.

     This similarity is prolonged during the embryonic phase as individuals of different species show certain similarities in adulthood.

     Embryonic development (or embryogenesis) is the set of transformations that take place from fertilization to birth. During embryonic development, different phenomena are distinguished, which are identical for different species: cell multiplication, morphogenetic movements and cell differentiation.

    In vertebrates this development is continuous although it is possible to distinguish three distinct phases: segmentation, gastrulation and organogenesis.

    After the fertilization that gives rise to the egg or zygote, it undergoes several transformations. The egg is a diploid cell, resulting from the fusion of the two haploid gametes. The components of the egg are generally distributed in a heterogeneous way, so it is common to have a polarity. In these cases, an animal pole (protolecite zone) and a vegetative pole (deutolecite zone) can be distinguished in the cell. The germline protolecite or calf is composed of the active cytoplasm of the cell (hyaloplasm and organites) and the deutolecite or nutrition calf is composed of the nutrients necessary for the development of the embryo.