The Hox genes came to regulate each of the following in what sequence, from earliest to most recent?

1. identity and position of paired appendages in protostome embryos

2. formation of water channels in sponges

3. anterior-posterior orientation of segments in protostome embryos

4. positioning of tentacles in cnidarians

5. anterior-posterior orientation in vertebrate embryos

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#Question id: 10825

#XL - T Zoology

What are beltian bodies?

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#Question id: 4943

#XL - S Microbiology

In what way were conditions on the early Earth of more than 3 billion years ago different from those on todayʹs Earth?

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#Question id: 17806

#XL - R Botany

Which of the following is not a characteristic that distinguishes gymnosperms and angiosperms from other plants? 

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#Question id: 10705

#XL - T Zoology

Which of the following statements is TRUE for an ecotone?

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#Question id: 11155

#XL - S Microbiology

Nucleic acid sequences that undergo few changes over the course of evolutionary time are said to be conserved. Conserved sequences of nucleic acids