1.
The answer is morphology. This is the use of
similarities and differences in physical
characteristics of the organisms. In addition to morphology, today, the use of
genetic comparisons have helped phylogenetics to have higher fidelity.
2.
The answer is Mesozoa. The group is composed of
maily marine invertebrates that are worm-like in characteristic and are usually
ciliated. Dicyemida and Orthonectida are the two
main groups of the Mesozoa phylum.
3.
The answer is arthropods.
This is because the phylum is mostly comprised of insects (Class Insecta has
over 800,000 discovered species). Insects are the most abundant organisms on
earth and also the most diversified. Again every molt and metamorphosis of these insects presents a
different instar in the organisms.
4.
Fish are entirely aquatic while amphibians are
not. Amphibians can survive in land in their adulthood. Amphibians have larvae
stages hence metamorphose. Fishes on the other hand rarely metamorphose. Adult amphibians have limbs while fishes have
fins. Examples of amphibians are frogs
and tortoises. Examples of fishes are sharks and catfish
