ACTIVITY 1

Question 1

LUCA

Answer 1

last universal common ancestor

Question 2

was believed to be alive around 3.5 billion years ago.
Scientists believe all life as we know it has evolved from a common ancestor

Answer 2

LUCA

Question 3

We have discovered just around 1.3 million species, but scientists predict that there are several million more out there that we haven’t discovered yet.

Answer 3

true

Question 4

The system most used is based on the characteristics of living things and this
taxonomy was first formalized by who in the eighteenth century.
The system involves sorting living things into groups and breaking those groups into multiple subgroups.

Answer 4

Carl von Linné (Carolus Linnaeus)

Question 5

The largest groups of life are domains, of which there are three:

Answer 5

Bacteria, Archaea, and
Eukarya

Question 6

are all around us but are difficult to see without a microscope.
mostly free-living organisms often consisting of one biological cell.

Answer 6

Bacteria

Question 7

are unicellular organisms that are the only life able to survive in the most extreme conditions.

Answer 7

Archaea

Question 8

have a cellular nucleus in common
and are what we typically think of as “life”.

Answer 8

Eukarya

Question 9

six kingdoms

Answer 9

Animals, Plants, Fungi, Protists, Bacteria, and Archaea

Question 10

are considered both domains and kingdoms.

Answer 10

Bacteria and Archaea

Question 11

Eukarya domain contains the other kingdoms:

Answer 11

Eukarya domain contains the other kingdoms:

Question 12

is a group of organisms that can reproduce and make fertile
offspring

Answer 12

species

Question 13

taxa

Answer 13

Domain
Kingdom
Phylum
Class
Order
Genus
Species

Question 14

refers to various names according to a specific field of study

Answer 14

Scientific nomenclature

Question 15

is the clade of animals once thought to be characterized by the formation of the organism’s mouth before its anus during embryonic development.

Answer 15

Protostomia

Question 16

typically characterized by their anus forming before the mouth during embryonic development.

Answer 16

Deuterostome

Question 17

lacks true tissues and organs but consists specialized cells to perform different functions

Without true Tissue
Asymmetrical
No germ layers

No body cavity

Answer 17

Phylum Porifera

Question 18

possess specialized cells called cnidocytes, which contain stinging structures call nematocysts for defense mechanism

With true Tissue
Radial
2 germ layers

No body cavity
Protostome

Answer 18

Phylum Cnidaria

Question 19

flattened body shape with bilateral symmetry

With true Tissue
Bilateral
3 germ layers

No body cavity
Protostome

Answer 19

Phylum Platyhelminthes

Question 20

cylindrical, unsegmented body

With true Tissue
Bilateral
3 germ layers

with body cavity
pseudocoelomate
Protostome

Answer 20

Phylum Nematoda

Question 21

closed circulatory system
Bilateral
3 germ layers

with body cavity
pseudocoelomate
Protostome

Answer 21

Phylum Annelida

Question 22

have highly specialized nervous system and exhibit a wide range of adaptations for different environments

Bilateral
3 germ layers

with body cavity
pseudocoelomate
Protostome

Answer 22

Phylum Arthropoda

Question 23

exhibit a unique water vascular system used for movement, feeding, and gas exchange.

Radial
3 germ layers

with body cavity
Deuterostome
Protostome

Answer 23

Phylum Echinodermata

Question 24

presence of notochord which is a dorsal hollow nerve cord.

With true Tissue
Radial
3 germ layers

with body cavity
coelomate
Protostome

Answer 24

Phylum Chordata

Question 25

have muscular foot for movement

With true Tissue
Bilateral
3 germ layers

with body cavity
coelomate
Protostome

Answer 25

Phylum Mollusca

Question 26

organisms that have false body cavities. They have a fluid-filled body cavity separating the gut of the organism from the body wall but it is not lined by mesoderm

Answer 26

pseudocoelomate

Question 27

have a body cavity called a coelom with a complete lining called peritoneum derived from mesoderm

Answer 27

coelomate