It applies to both.
Cell theory states that plants and animals are composed of cells. Humans are composde of trillions of cells and amoeba is composed of only single cell. The cell theory also states that every cell comes from pre-existing cells. Humans, through sexual reproduction(fusion of two cells - male gamete called sperm and female gamete called ova), reproduces and amoeba, through asexual reproduction(binary fission), reproduces its own kind.
Both are made of cells or cells with a nucleus
They do not have a cell wall. They have a cell membrane, which is the outer layer of the cell. Much like skin in a human. The only type of cells that have a cell wall are plant cells. :)
A macrophage, a white blood cell, is very similar to an amoeba in how it moves and eats.
Porn
amoeba is cell not a organism.
no, a single cell cannot grow.
cells are in a amoeba
no, a single cell cannot grow.
Virus
yes amoeba is a variable shape cell
No. Diffusion only works for "cell" sized organisms.