What are the hard parts of life forms found in rocks called?

Describe the phenomenon of moths observed in industrial areas of England that supports evolution by natural selection.

Which of the following is not the result of convergent evolution?

$A$ certain animal possesses shelled eggs,hair,and mammary glands,and also has a cloaca. It acts as a connecting link between which of the following?

In $Bougainvillea$ and $Cucurbita$,the axillary bud is modified into thorn and tendril respectively. This is an example of:

Give differences between homologous structures and analogous structures.