OBJECTIVE LIFE SCIENCE
EVOLUTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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They all have similar components in their blood.
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They all maintain similar number of chromosomes.
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They have similar habitat requirements.
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They share a common genetic heritage.
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Detailed explanation-1: -look very similar and it is often difficult to tell them apart. Many traits of one type of animal appear in the embryo of another type of animal. For example, fish embryos and human embryos both have gill slits. In fish they develop into gills, but in humans they disappear before birth.
Detailed explanation-2: -Similarities in embryos are evidence of common ancestry. All vertebrate embryos, for example, have gill slits and tails (see the Figure below). Most vertebrates, except for fish, lose their gill slits by adulthood. Some of them also lose their tail.
Detailed explanation-3: -Similarities among different species can show two different kinds of relationships, both of which support evolution and natural selection. These similar structures are known as homologous structures and analogous structures.
Detailed explanation-4: –humans and fish share a common ancestor that had gills. During development in the mother’s uterus, human embryos have pharyngeal pouches (sometimes called gill slits) that later develop into various glands. Fish also have pharyngeal pouches as embryos, but these develop into gills.