- ALoss of biodiversity.
- BLoss of alien species.
- CLoss of standing crop.
- DLoss of climax community.
Explanation:
The evil quartet is the concept that describes the reasons which cause a decrease in the number of species.
There is a loss of biodiversity due to four main reasons which were known as the four horsemen of the ecological apocalypse.
The reasons are overexploitation, loss of habitat, the introduction of exotic species, and co-extinction of species.
These reasons were studied by the researchers and were put forward as the main reasons for the future extinction of the species.
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$(i)$ $RNA$ can directly code for the synthesis of proteins
$(ii)$ It is very common process to synthesis $DNA$ from $RNA$
$(iii)$ $RNA$ is used as genetic material only in human
$(iv)$ One polynucleotide chain is present in $RNA$