MCQ
______ are cell fragments rather than true cells.
- AErythrocytes
- BGranulocytes
- ✓Thrombocytes
- DAgranulocytes
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Reason : In the primitive atmosphere, oxygen was involved in forming ozone
$R$ - Thus, dung can be used in biogas.
|
Column- $I$ |
Column- $II$ |
|
$A.$ $500$ million years ago |
$1.$ Sea weeds and few plants |
|
$B.$ $350$ million years ago |
$2.$ Jawless fishes |
|
$C.$ $320$ million years ago. |
$3.$ Inverbebrates |