Answer:
pioneer species
Explanation:
Primary succession begins in barren areas, such as on bare rock exposed by a retreating glacier. The first inhabitants are lichens or plants—those that can survive in such an environment. Over hundreds of years these “pioneer species” convert the rock into soil that can support plants.
I believe it is a 2:1 ratio of hydrogen to oxygen, because the way i learned was that carbon hydrogen and oxygen have a ratio of 1:2:1, respectively.
Examples of prokaryotic cells include:
<span>bacteria
<span>algae</span></span>
Domain of unicellular prokaryotes that have cell walls containing peptidoglycan; corresponds to the kingdom Eubacteria. Domain consisting of unicellular prokaryotes that have cell walls that do not contain peptidoglycan; corresponds to the kingdom Archaebacteria.
The pancreas produces pancreatic juice, while the liver produces bile, which are essential in digestion processes
