Which of the following major ideas were proved by Gregor Mendel?
-
A.
There is a tendency among organisms `to increase rapidly in number if conditions are favourable -
B.
There is a struggle for existence among a very large number of offspring -
C.
Nature selects organisms which will survive to produce their kind -
D.
All species exhibit structural and functional variations -
E.
Characteristics of an organism are controlled by genes occurring in pairs