BIOLOGY: Animal diversity Crossword Key Terms
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Across
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The principle which states that physical forces working today to alter the earth were also in force and
working in the same way in former times.
A mammal that gives birth to under-developed young and rears them in a pouch
Layered structures built by colonies of microorganisms which are commonly found in fossil records.
A formal term for a cave formation. They are the result of the interactions among water, rock, and the
atmosphere within caves
The most primitive mammals comprising the only extant members of the subclass Prototheria
Small closed vesicle consisting of a single lipid bilayer.
A mammal, such as humans, whose young complete their embryonic development in the uterus, joined
to the mother by an organ made of embryonic and maternal tissues in close union.
USA 10 to the power of 9. Europe 10 to the power of 12
The sum total of all the living organisms of any designated area.
USA 10 to the power of 12
Down
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A membranous sac that encloses the embryo or foetus. Homologous characteristic in some egg laying
and all live bearing species.
Small scale genetic changes in organisms through mutations resulting in slight changes in an organism.
A break or gap in the geologic record, as recorded in adjacent rocks.
An interplanetary body, of varying size not associated with a fixed orbit
Large scale change in organisms resulting in new species, genera, families, etc.
The physics of energy, heat, work, entropy and the spontaneity of processes. Literally meaning heat
change.
An aggregate of abiotically produced molecules, suggested as having a key step in the origin of life on
earth.
Field of biology that deals with the grouping and organizing of organisms.
PASS Session 5 Crossword - ANSWER KEY
1
A
2
U N
I
F O R M I
T A R
I
A N
I
S M
3
N
4
M
5
M A R S U P
I
N
O
C
N
A
L
I
C
R
6
O
7
A
8
M
O
9
T
N
S T R O M A T O L
H
F
T
C
10
12
R
P
S
O
O
R
Y
L
M
M O N O T R E M E
O
S
U
O
I
T
T
T
P O S O M E
I
R
E O T H E M
T E
V
11
S P E L
I
R
R
13
I
V
14
D
T
Y
Y
D
L
I
N
L
B
M
O
U
I
A
N
T
O
T
I
O N
I
15
P L A C E N T A
L
16
M
B
I
L
L
17
B
I
O T A
O
T
C
18
C
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