The phylum Nematoda consists of
A. the nematodes or roundworms
B. desert-loving organisms.
C. only parasites.
D. only marine organisms.
A. the nematodes or roundworms
The phylum Nematoda consists of A. the nematodes or roundworms.
To find the answer, we need to understand the characteristics of the phylum Nematoda. The phylum Nematoda is commonly known as nematodes or roundworms. These organisms have certain distinct features that help us identify them.
Option A: The nematodes or roundworms are indeed part of the phylum Nematoda. They are slender, unsegmented worms with a relatively simple body structure.
Option B: There is no specific reference to desert-loving organisms within the phylum Nematoda. Therefore, this option can be eliminated.
Option C: While it is true that some nematodes are parasites, not all nematodes fall into this category. Nematodes can be found in various ecological roles, including parasites, free-living organisms, and decomposers.
Option D: Similarly, not all nematodes are exclusively found in marine environments. Nematodes inhabit diverse habitats, including soil, freshwater, and marine environments.
Considering this information, the correct answer is option A: the phylum Nematoda consists of the nematodes or roundworms.