Answer:
DNA/ Traits
Explanation:
they trace species origins back and find common point and every time they do, they connect them on the line, creating something that looks like "branches" google "cladogram"
The human brain consumes up to 20% of the energy used the entire human body which is any other single organ. the brain represents inly 2%of the body wheight yet it recieves 15% of the cardiac output and 20% of the total body oxygen consumption.
The blood carries carbon dioxide away from the cells
