Question

Which group of animals is the most closely related to the echinoderms?

Question 1 options:

Sea squirts (urochordates)


Arthropods


Molluscs


Flatworms

Question 2 (1 point)
Which statement about metamorphosis is TRUE?

Question 2 options:

Metamorphosis only happens when a caterpillar becomes a butterfly.


Metamorphosis occurs in all animals.


It is a process of transformation that has evolved multiple times in different animal groups because it is a valuable way to keep the young and old of the same species from competing for food resources.


None of these statements are true.

Question 3 (1 point)
How do most bony fish reproduce?

Question 3 options:

Oviparous, external egg spawning


Laying hard shelled eggs in a nest


Internal fertilization using claspers


Cloning

Question 4 (1 point)
As vertebrate animals moved on to land, it is thought that …

Question 4 options:

Reptiles had the backbones (vertebrae) that bony fish lacked.


Amphibians had special electrosenses that cartilaginous fish lacked.


Reptiles evolved the waterproof keratin body covering that amphibians lacked.


Amphibians evolved the keratin covering that reptiles lacked.

Question 5 (1 point)
Saved
The lamprey and the hagfish are classified as Agnathans. What does that mean?

Question 5 options:

They have no skeleton.


They have no skin.


They have no eyes.


They have no jaws.

Answer 1

Here are the answers to your questions:

**Question 1:** Which group of animals is the most closely related to the echinoderms?
**Answer:** Sea squirts (urochordates)
(Echinoderms are part of the deuterostome group, which also includes the urochordates and vertebrates.)

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**Question 2:** Which statement about metamorphosis is TRUE?
**Answer:** It is a process of transformation that has evolved multiple times in different animal groups because it is a valuable way to keep the young and old of the same species from competing for food resources.
(This is a correct representation of how metamorphosis functions in various species.)

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**Question 3:** How do most bony fish reproduce?
**Answer:** Oviparous, external egg spawning
(Most bony fish reproduce by laying eggs in water where fertilization occurs externally.)

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**Question 4:** As vertebrate animals moved on to land, it is thought that …
**Answer:** Reptiles evolved the waterproof keratin body covering that amphibians lacked.
(Reptiles have evolved adaptations, like waterproof skin, to survive on land which amphibians do not have.)

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**Question 5:** The lamprey and the hagfish are classified as Agnathans. What does that mean?
**Answer:** They have no jaws.
(Agnathans are jawless fish, which include both lampreys and hagfish.)

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Feel free to ask if you have any more questions or need further clarification!