The History of Life on Earth: Crash Course Ecology #1

HOW MANY YEARS AGO DID EARTH FORM?

• 1.6 BILLION

• 2.6 BILLION

• 3.6 BILLION

• 4.6 BILLION

Tags

NGSS.HS-ESS1-6

What chemicals formed in the Earth’s first seas 4.4 billion years ago?

• nitrogen, nitrogen oxides

• carbon dioxide, methane

• ammonia, hydrogen, hydrogen sulfide

• BLEACH

Tags

NGSS.HS-ESS1-6

OVER TIME SOME OF THE EARLY CHEMICALS IN THE OCEAN DEVELOPED INTO...

• AMINO ACIDS

• WATER

• FORESTS

• PEPSIN

Tags

NGSS.HS-LS1-6

WHAT DID THE AMINO ACIDS EVENTUALLY BECOME?

• RNA

• DNA

• PTO

• OUI

WHY IS DNA a way more stable repository for genetic information?

• IT'S DOUBLE STRANDED

• IT'S TRIPLE STRANDED

• IT'S SINGLE STRANDED

• ALL OF THE ABOVE

IS RNA SINGLE OR DOUBLE STRANDED?

• SINGLE

• DOUBLE

The first living things were _________________, single-celled organisms with no nuclei.

• prokaryotes

• protons

• profootballites

• proactives

Prokaryotes made their debut during the time period known as the __________.

• Archaean Eon

• ARMY EON

• ARCHES EON

• ARCHENEMY EON

When did the amount of oxygen in the atmosphere suddenly increase?

• LAST YEAR

• 2.1 BILLION YEARS AGO

• 1.2 BILLION YEARS AGO

• 3.1 BILLION YEARS AGO

HOW DID THE AMOUNT OF OXYGEN SUDDENLY INCREASE IN THE EARTH'S ATMOSPHERE?

• THROUGH cyanobacteria

• THROUGH CYBORGS

• THROUGH CHINA

• THROUGH CYANOCRACKS