With the beginning of the middle proterozoic comes the first evidence of oxgen build up in the atmosphere. with is catastrophe came eukaryotic forms. these include multicellular algae, and toward the end of the proterozoic the first animals
Eukarya. This is because their cells all have a nucleus. While prokaryotes like archaea and bacteria don't have one, eukarya have a nucleus.
Answer:
C. A hillside that has been cleared by a volcanic eruption.
Explanation:
Pioneer species are hardy species which are the first to colonize barren environments or previously biodiverse steady-state ecosystems that have been disrupted, such as by fire or other natural disasters. Some lichens grow on rocks without soil, so may be among the first of life forms, and break down the rocks into soil for plants.
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They came over on an <span>umbilical cord.</span>
There are 5 levels of cell organization recognized by biologists.
