do you think aquatic plants undergo photosynthesis? where/how do aquatic plants obtain the CO2 needed to go through the process

Yes. Aquatic plants may take in carbon dioxide from the air or water, depending on whether their leaves float or are under water. The leaves of floating plants, such as lotus and water lilies, get direct sunlight. ... They can take in carbon dioxide from the air and release oxygen into the air.

the median of the data is 4.5.

the second type of galaxy is called a barred spiral, which has a thing called a bar straddling the nucleus