Question

a. about animals Differentiate the items in each pair:
1. placental mamals and marsupial mamals
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2. vertebrates and invertibrates
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b. essay
1. why can a salmon stay under water all the time but a dolphin connot?

c. Write what is OTHER ORGANS inviolved in the EXCRETORY SYSTEM and give one {1} function of each ?



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Answer 1

Answer:

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