The trace or remains of a organism that lived long ago

What is the fluid part of the blood?

Each strand of _ contains two halves that are connected in the middle and twisted in a double helix

Any fossilized evidence of animal activity

a connective tissue made up of plasma, red blood cells, platelets, and white blood cells

Fossils of organisms that lived during a relatively short well- defined geologic time span.

the force of the blood on the inside walls of the arteries

plates move and change their shape

they supply every living cell with oxogyn

what is RNA

a blood vessel that carries blood away from the heart