MCQ
Transport of $O_2$ is done by:
- APlasma
- ✓$\text{RBC}$
- CLungs
- DNostrils
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$I.$ In gymnosperms, the male and female gametophytes have an independent existence.
$II.$ The multicellular female gametophyte is retained within the megasporangium.
$III.$ The gymnosperms are heterosporous.
Of these statements