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Home Q & A Board Biology-Related Homework Help General Biology
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Guido Guido
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7 years ago
One trend in the evolution of animals is the increase in the number of tissue (germ) layers during embryonic development. Flatworms and more complex animals have ________ layers.
A) two
B) three
C) four
D) five
E) six
Textbook 
Biology: Life on Earth

Biology: Life on Earth


Edition: 10th
Authors:
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skeledentskeledent
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7 years ago
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Guido Author
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7 years ago
I appreciate what you did here, answered it right Smiling Face with Open Mouth
jblazah
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Yesterday
this is exactly what I needed
apelton
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2 hours ago
Correct Slight Smile TY
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