sponges
They were prokaryotic and anaerobic organisms developed first due to the early environmental condition on earth.
prokaryotic and anaerobic
hard body parts
early organisms created oxygen from other gases in the atomsphere
the appearance of oxygen-producing organisms
it should be brachiopods
Although its a paradox to believe anything beyond the time of known history evidence suggests that life started in water like habitats. But the organisms radically changed the planets water habitats so much that those early habitats no longer exist. Evidence is based on sampling the current environment and suggesting the theory now commonly accepted as the description of prehistory.
They are called bellwether species, also known as sentinel species.
The study of early development of plants and animals is known as botany. This also looks at the relationship between plants and animals.
Ruth A. Wilson has written: 'Starting early' -- subject(s): Environmental education, Environmental sciences, Study and teaching (Early childhood)
The middle class developed in Northern society in the early 1800s.
The Man.
All of the early helicopters were developed during WW2
the early 80's :)
Aristotle
relating to a work place environmental conditions and the experiences known to have positive effects on prenatal and early childhood
embryology
bacteria
ansector