One common feature of fungi, algae, mosses and ferns is that they are

Explanation

Fungi, algae, mosses, and ferns are all groups of organisms that share certain features. One of these features is that they all lack seeds, which is what Option D correctly states. Unlike flowering plants, which produce seeds, these groups of organisms reproduce through other means such as spores or fragmentation. Fungi, algae, mosses, and ferns also share the feature of being able to survive harsh weather conditions. Some of them can even survive extreme conditions like drought or extreme cold. However, not all of them are photosynthetic. While algae and some species of fungi can perform photosynthesis, others like mosses and ferns cannot. Another feature that some of these groups share is alternation of generations, which is a complex life cycle involving both haploid and diploid stages. This life cycle is present in some types of algae and ferns, but it is not a universal feature among all the groups mentioned in the question. Finally, the option conjugate is not related to any of the features shared by these groups of organisms. Therefore, it is not the correct answer to the question. In summary, the correct answer to the question is Option D because fungi, algae, mosses, and ferns do not have seeds.