Question

#1. larger than 1.5 inches go to #2
smaller than 1.5 inches go to #3
#2. larger than 6 inches cane toad
(bufo marinus)
smaller than 6 inches go to #3
#3. skin is smooth green tree frog
(litoria caerulea)
skin has warts go to #4
#4. triangle between the eyes northern cricket frog
(acris crepitans)
no triangular mark on head go to #5
#5. stripe on back from head to tail western toad
(bufo boreas)
x - shaped mark on back spring peeper
(pseudacris crucifer)
the frog pictured above is larger than 1.5 inches and smaller than 6 inches. use this information, along with the dichotomous key shown and your own observations from the picture, to determine the frogs species name.
a. litoria caerulea
b. acris crepitans
c. bufo marinus
d. bufo boreas

Explanation:

1. 已知青蛙大于\(1.5\)英寸且小于\(6\)英寸，根据二分检索表，从\(\#1\)到\(\#2\)，因为小于\(6\)英寸，所以到\(\#3\)。
2. 观察图片，青蛙皮肤有疣（warts），所以到\(\#4\)。
3. 图片中青蛙头部没有三角形标记（No triangular mark on head），所以到\(\#5\)。
4. 图片中青蛙背部有从头部到尾部的条纹（Stripe on back from head to tail），对应\(Bufo boreas\)。

Answer:

D. \(Bufo boreas\)