What am I? I am all around the world
My pull keeps planets aligned
My push makes things move
I also have a big role in Star Wars.
What am I?

Compare and contrast cladistics and phylogeny. what are their advantages and disadvantages? which is the most useful in understanding how an organism developed into its current form? which concept most strongly supports your opinion about the origin of any given organism?

Explain how the number of similarities between the embryos from early stage to late stage is used as evidence of a common ancestry

What kinds of molecules can pass through the cell membrane without any problem?