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Biology, 29.02.2020 01:59 gatornathan79

How are animals divided into groups based on the morphological trait of the number of tissue layers during development?

a.) two groups: those that have three tissue layers in their embryos and those that have two

b.) three groups: those that have four, three, or two tissue layers in their embryos

c.) three groups: those that have three, two, or one tissue layers in their embryos

d.) two groups: those that have two tissue layers in their embryos and those that have one

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