Pylogenetic tree diagram is a diagram that represent evolutionary relationships among organisms. It reflect how species or other groups of organism evolved from a series of common ancestor.From this pylogenetic tree diagram the least related organism is insecta and Trilobites
An in-breath is that you are breathing in Oxygen. And and out-breath you are breathing out Carbon Dioxide
A. Group of cells
Cells - Tissue - Organ ...
If you want to know more - look for "Biological Organisation"
A law is 100% proven while a theory is not. A law is never wrong while a theory, although widely accepted or has been tested hundreds to thousands of times, may be found incomplete or eventually wrong.
It has four main components: plasma, red blood cells, white blood cells, and platelets. Blood has many different functions, including: transporting oxygen and nutrients to the lungs and tissues. forming blood clots to prevent excess blood loss.