Unit 6 Review

The most common Precambrian fossils are ________, layered mounds of calcium carbonate.

• prokaryotes

• chert

• trilobites

• eukaryotes

• stromatolites

Answer explanation

Stromatolites formed from secretions by photosynthetic organisms (cyanobacteria). The organisms would deposit the sediment in layers.

Tags

NGSS.MS-LS4-1

Scientists have found evidence that life existed at least 3.5 billion years ago ________.

• in northern Siberia

• on the Gulf Coast

• throughout North and South America

• in Kenya

• in several locations around the world

Tags

NGSS.MS-LS4-1

Which type of bacteria thrive in environments that lack free oxygen?

• aerobic

• placental

• anaerobic

• foraminifera

• photosynthetic

Which of the following are not one of our hypothesis's ?

• prokaryotic cells were the first life
• microbes were the first life
• nucleotide were the first life
• atoms were the first life

As scientists discover more, can their answer change. ( remember, their question was: "what was the first life on Earth?".Their answer is Archaea.)

• Yes! Scientists always find more possible answers. So it is possible
• Of course not. The answer is always gonna be Archaea.

Where do scientist believe the first life developed?

• On land

• On the surface of the oceans

• In Glaciers

• Deep in the Ocean

What type of organism was the first to develop?

• heterotroph

• Photosynthetic Autotroph

• Chemoautoroph

• Eukaryotic cell

The Endosymbiotic Theory explains

• the origin of prokaryotes

• how bacteria lives

• the origin of eukaryotes

• how species develop

Tags

NGSS.MS-LS4-2

Bacteria are an example of a ____ cell.

• prokaryotic

• eukaryotic

• plant

• animal

Tags

NGSS.MS-LS1-1

_____ and _____ are organelles that arose from endosymbiosis

• nucleus and cell membrane

• mitochondria and chloroplasts

• cell wall and chloroplasts

• mitochondria and nucleus