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Some dinosaurs had feathers although they could not fly but birds have feathers that help them to fly. In the context of evolution, this means that (a) reptiles have evolved from birds (b) there is no evolutionary connection between reptiles and birds (c) feathers are homologous structures in both the organisms (d) birds have evolved from reptiles

d) Birds have evolved from reptiles Dinosaurs were reptiles, belonging to the class Reptilia, whilst birds belong to their own class, Aves.... View Article

Select the statements that describe characteristics of genes (i) genes are a specific sequence of bases in a DNA molecule (ii) a gene does not code for proteins (iii) in individuals of a given species, a specific gene is located on a particular chromosome (iv) each chromosome has only one gene (a) (i) and (ii) (b) (i) and (iii) (c) (i) and (iv) (d) (ii) and (iv)

b) (i) and (iii) Explanation Genes control the functions of DNA and RNA. Proteins are the most important materials in the human body which not... View Article

If the fossil of an organism is found in the deeper layers of earth, then we can predict that (a) the extinction of organism has occurred recently (b) the extinction of organism has occurred thousands of years ago (c) the fossil position in the layers of earth is not related to its time of extinction (d) time of extinction cannot be determined

b) The extinction of organisms has occurred a thousand years ago Fossils provide direct evidence of evolution. Fossils are body remains of dead... View Article