science q10,3

change in the characteristics of a species over several generations.

These are the remains or impressions left by an animal or by plants preserved in the earth's crust.

Structures suggesting similar ancestors of different species irrespective of their appearance or functions.

Structures which have similar appearance but originate from different ancestors.

It is an early stage of development in an organism

Theory of inheritance and acquired characteristics.

In 1801, he presented his theory on evolution: he proposed that organisms evolve through time from being lower forms to higher beings

• Characteristics or traits that are needed and used always will be passed on to the next generations, and those disused will eventually be forgotten and not passed on.

• Theory of evolution by natural selection

• proposed that species can change over time, that new species come from pre- existing species, and that all species share a common ancestor.