Convergent evolution, where similar structures evolve independantly in distanlty related organisms, or even variability within a species (group of organisms that are genetically similar enough to eachother to have fertile offspring) can make grouping based on physical characteristics problematic.
Prokaryotes and other types of asexual species. Naturally, it can not be applied to fossils of any type.
Asexual Organisms, because this concept relies on reproduction and hybrid sterility, which cannot be tested on organisms that do not sexually reproduce.
they all have cells
derived characters
Lamarck believed that there was a form of evolution, but contrary to Darwin after him, he believed that the characteristics an organism acquires during his life are inherited by its descendants. For more on Lamarck's hypothesis, see the related question below.
Organisms that can interbreed are all members of the same species if their offspring are viable (can themselves breed).
Derived Characteristics.
That is a silly answer, not meant to be helpful; meant to be annoying and show ignorance. Elements are "grouped" in 18 (vertical) columns or "families". Without getting too complicated, the "grouping" indicates that all elements in that same group or family share similar chemical or physical characteristics - just as members of the same "human family" do . . . . resemble each other.
FVKNIG
FVKNIG
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they are responsible, and thoughtful
These characteristics of organisms are called adaptions.
What are the physical features do we share with our family members
they all have cells
Jews and Christians
Cell wall/cell membrane