Along roadsides in ditches and ponds, you would most likely find

There are no choices but I am assuming that you are asking about plant life organisms within these environments. Along roadsides in ditches and ponds, you most likely find, mosses, these plant organisms thrive in areas where it is mostly humid. These areas provide this type of environment which makes these organisms abundant.

You would most likely find Spirogyra

Spirogyra is very common to be found on clean euthropic water, developing slimy filamenteous green masses. Spirogyra is a type of green Algae that can produce a large amount of oxygen under the right amount of Warmth and sunlight

The basic building blocks of dna and rna are nucleotides