3. what are the primary tissue types present in endocardium, myocardium, and epicardium? each of these tissues serves a specific purpose. identify why each structure is composed of that particular tissue type. what purpose does each serve?

a symbiotic relationship with the mitochondria

they have identical fossils of organisms that have evolved over time.

both have animal fossils preserved in them due to weathering and erosion.

they contain different fossils because life on earth has changed through time.

the fossils in them were formed on the surface of earth due to exposure to sunlight.