Which of the following is correct
$99\% $ of existed species are extinct
$25\%$ of existed species are extinct
$40\%$ of existed species are extinct
$30\% $ of existed species are extinct
Resource partitioning includes
The average concentration of $CO_2$ in the atmosphere is
Ratio between mortality and natality is called
Loss of upper fertile layer of soil is known as
The possible beneficial affect of grazing animals is the