Question

which structures are found in all early vertebrate embryos? select all that apply a leg, flipper or wing bones b gill slits c tail

Explanation:

To determine the structures in all early vertebrate embryos, we analyze each option:

• Option a: Leg, flipper, or wing bones are specialized structures that develop later and not all early embryos have them (e.g., fish embryos don't have leg bones at early stages).
• Option b: Gill slits are present in all early vertebrate embryos. In some vertebrates (like humans), these gill slits later develop into other structures (e.g., parts of the ear and throat), but they are present in the early embryonic stage.
• Option c: A tail is present in all early vertebrate embryos. Even in species where the tail is lost in the adult (like humans), a tail - like structure is present during early embryonic development.

Answer:

b. gill slits, c. tail