Organisms that absorbs and uses nutrients of living or dead organisms are called saprophytes.
Earth's inner core is solid because of the extreme pressures and underneath the earth.
It indicates what elements is composed by and how many atoms of one element are linked to the other.
For example, this is the formula for table salt is:
NaCl
The formula indicates that table salt (sodium chloride) is composed by sodium (Na) and chlorine (Cl) on a 1:1 ratio.
Hope it helped,
BioTeacher101
The producers at the beginning of the Earth's food chain are plants.