MCQ
Ecology takes into account only
- AEnvironmental factors only
- BPlant adaptations only
- CEffect of environment on plants
- ✓All of the above
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$(A)$ The earliest organisms that appeared on the earth were nongreen and presumably anaerobes.
$(B)$ The first autotrophic organisms were the chemoautotrophs that never released oxygen.Of the above statements which one of the following options is correct?
$A.$ Periodic abstinence
$B.$ Withdrawal
$C.$ Coitus interruptus
$D.$ Lactational amenorrhoea