Name the primates that existed 15 million years ago.

Rearrange the following in the correct order of their apperance on Earth between two million years and 40,000 years back Neanderthals, Australopithecus, Homo erectus and Homo habilis.

Which one is present today but was absent about 3 to 5 billion years ago?

Form the pair of linear equations for the foIlowing problems find their solution by substitution method: Five years hence, the age of Jacob will be three times that of his on. Five years ago, Jacob's age was seven times that of his son. What are their present ages?

Name the type of food chain that exists in a pond.

Aman’s age is three times his son’s age. Ten years ago he was five times his son’s age. Find their present ages.

Name the property under multiplication used in each of the following : (-3/16 x 8/15) = (8/15 x -3/16)

Name a cell that is found arrested in diplotene stage for months and years. Comment in 2-3 lines how it complete cell cycle?

Name the property under multiplication used in each of the following : 2/3x(6/7xx-14/15) = (2/3 xx 6/7)xx-14/15