AnswersOH-Biology BLab: Using a Dichotomous Key

Lab: Using a Dichotomous Key Answers

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Which of the below best describes the focus of the questions in the dichotomous key?

A
observable features of fish
B
descriptions of habitat for fish
C
descriptions of eating behaviors of fish
D
skeletal structures of fish
3

This fish shown has a body shape.

A
fusiform
B
depressed
C
laterally compressed
4

4

A
Dorsal
B
Pectoral
C
Pelvic
D
Anal
E
Caudal
5

5

A
Dorsal
B
Pectoral
C
Pelvic
D
Anal
E
Caudal
6

While using a dichotomous key to identify a species of fish, you must start with

A
any question, since the questions all eventually lead you to the correct species.
B
the question that you finished with while identifying the previous fish.
C
the first question, no matter what.
D
the question that seems most likely to identify the fish you are observing.
7

1

A
Fins
B
Tail
C
Jaw
D
Gills
8

2

A
Fins
B
Tail
C
Jaw
D
Gills
9

1

A
Dorsal
B
Pectoral
C
Pelvic
D
Anal
E
Caudal
10

The shape of the caudal fin is.

A
crescent
B
forked
C
rounded
11

3

A
Fins
B
Tail
C
Jaw
D
Gills
12

2

A
Dorsal
B
Pectoral
C
Pelvic
D
Anal
E
Caudal
13

3

A
Dorsal
B
Pectoral
C
Pelvic
D
Anal
E
Caudal

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