Answer:
the answer is F oxygenated blood circulates back into the heart and is then pumped to all parts of the body through the arteries
The respiratory system that allows for Gas Exchange happens between Alveolar Spaces and Capillaries
The three parts of the cell theory are as follows: (1) All living things are made up of cells, (2) Cells are the smallest units (or most basic building blocks) of life, and (3) All cells come from preexisting cells through the process of cell division.
convergent evolution - called analogy
a potential source of confusion in constructing a phylogeny is similarity between organisms that is due to convergent evolution - called analogy - rather than to shared ancestry. thus for mammals, the backbone is a shared ancestral character, a character that originated in an ancestor of the taxon
