The given diagram depicts:

Flippers of a seal are:

Fossils are useful in

Age of fossils in the past was generally determined by the radio-carbon method and other methods involving radioactive elements found in the rocks. More precise methods,which were used recently and led to the revision of the evolutionary periods for different groups of organisms,include:

Select the correct option for analogy.

According to Haeckel's Law of Biogenesis,which of the following is true?