Sporangium of fern is found in

Explanation:

In ferns, sporangia are typically found on the abaxial surface (underside) of the leaf and are densely aggregated into clusters called sori. Sori may be covered by a structure called an indusium. Some ferns have their sporangia scattered along reduced leaf segments or along (or just in from) the margin of the leaf

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the answer is b.) hydrogen bonds between bases.

not only is it colder, it also becomes darker, less salty, and more dense.