Lesson: Chapter 13 — The Living World

13.1. Vertebrates 1 of 8 Reset answers

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Question 1

When do vertebrates show the characteristics they have in common?

A Only at death B Only when fully grown C At some stage of the life cycle D Throughout life

The right answer is the one marked above.

At some stage of the life cycle. The grown animal may show none of them while the embryo does.

A human has no gill slits — but a human embryo does. That is why the characteristic is stated as "at some stage".

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