Patterns of Change in Life on Earth

What is needed for a fossil to form? Choose 2.

• The organism must first get stuck in rock.

• The soft tissue of the dead organism must be eaten by scavengers before the bones can be preserved.

• The tracks or burrows of an organism must be filled with sediments before they are disturbed.

• The organism's body must be covered by sediment or another substance before its body decays.

Scientists used radiometric dating which measured how much _______________ in the rock had changed to _____________.

• potassium/argon

• salt/pepper

• blood/tissue

• sediment/rock

Tags

NGSS.HS-PS1-2

The earliest organisms were about _____________ years old.

• 500 million

• centuries

• 3.8 billion

• 1 bazillion

Tags

NGSS.MS-LS4-1

The earliest organisms were __________ cells.

• complicated

• pretty

• ugly

• single

Tags

NGSS.MS-LS1-1

The evidence of the earliest organisms was not fossils, but ________________________.

• pictures of fossils

• traces of carbon

• cells

• protein

Many new types of organisms appeared during the ____________ period.

• old

• Cambrian

• Triassic

• Jurassic

Tags

NGSS.MS-LS4-1

The Cambrian explosion happened because of ____________.

• increased oxygen levels in the air from a particular bacteria

• there was too much dynamite

• mass extinction

• changes in identifying fossils

Tags

NGSS.MS-LS4-1

NGSS.MS-LS4-2

Many Cambrian animals had ________ because of predators.

• feet

• tails

• skeletons

• hard outer shells

Tags

NGSS.MS-LS4-1

What evidence from the fossil record supports the observation that life changes over time? Choose 2

• more fossils of the same species found in several rock layers

• increased numbers of fossils of different species found in younger rock layers

• several rock layers that do not contain fossils

• fossils of distant relatives of a modern species found in ancient rock layers

Tags

NGSS.MS-LS4-1

•More recent fossils have _____ __________ bodies and physical features than older ones.

• the same

• more complex

• land dwelling

• older rock

Tags

NGSS.MS-LS4-1

NGSS.MS-LS4-2