Life's History

Question 1

How long has the earth been around

Answer 1

4.5 billions years

Question 2

Bacteria

Answer 2

3.5 billions years ago oldest fossilized bacteria

Question 3

Eukaryotes

Answer 3

1.8 billion years ago eukaryotes appeared

Question 4

Multicellular eukaryotes

Answer 4

1.5 billion years ago multicellular eukaryotes multicellularity evolved in several groups giving rise to plants, Fungi and animals

Question 5

Oxygen

Answer 5

Oxygen appears 2.7 billions years ago

Question 6

Plants/animals

Answer 6

Evolution of plants and animals 500 million years ago

Question 7

what were the first multicellular organisms

Answer 7

colonies

Question 8

Order of events

Answer 8

Simple cell organisms, Eukaryotes, multi-cellular, water plants, animal life, land plants, insects, reptiles, dinosaurs, age of mammals, humans

Question 9

Theory of Endosymbiosis

Answer 9

explains origin of eukaryotic cells from prokaryotic ancestor. States that organelles such as chloroplasts and mitochondria were once free-living prokaryotes which eventually lived symbiotically within larger cells, forming modern day eukaryotes.

Question 10

Cambrian explosion

Answer 10

Cambrian period, during which most major animal phyla appeared (more predators), as indicated by the fossil record. we see the appearance of protosotomes and deuterostomes,
coelomates, pseudocoelomates, and acoelomates

Question 11

Hierarchical Classification

Answer 11

Domain, Kingdom, Phylum, Class, Order, Family, Genus, Species

Question 12

phylogenetic tree

Answer 12

hypothesis about evolutionary history

Question 13

Taxon

Answer 13

a group of related organisms

Question 14

Clade

Answer 14

a group of species that share a common ancestor

Question 15

Node

Answer 15

shared a common ancestor