Question

As true animals evolved, they became characterized by their embryonic tissue layers. Which tissue layer is found in the middle and gives rise to the muscles and some organs.

Question 1 options:

Endoderm


Ectoderm


Mesoderm


None of these

Question 2 (1 point)
Which statement is true about an acoelomate animal?

Question 2 options:

They are acoelomate because they have no mesoderm.


They are acoelomate because they have no open space inside the body.


They are acoelomate because they have radial body symmetry.


None of these statements are true.

Question 3 (1 point)
Members of the Phylum Porifera (the sponges) have individual cell types that have special jobs in the organism. Which cell type secretes the spicules?

Question 3 options:

Amoebocytes


Choanocytes


Porocytes


All cells can secrete spicules.

Question 4 (1 point)
Cnidarians have special cells that contain organelles that produce venom. What is the name of the stinging cells?

Question 4 options:

Amoebocytes


Colloblast cells


Cnidocytes


Nematocysts

Question 5 (1 point)
Which cnidarian is MIS-MATCHED with the examples of that group?

Question 5 options:

Scyphozoa- true jellyfish


Cubozoa- box jellies, sea wasps


Anthozoa- found in a colony, Physalia, Velella


All of the matches are correct

Answers

GPT-4o mini
Here are the answers to your questions:

**Question 1:** Which tissue layer is found in the middle and gives rise to the muscles and some organs?
**Answer:** Mesoderm

**Question 2:** Which statement is true about an acoelomate animal?
**Answer:** They are acoelomate because they have no open space inside the body.

**Question 3:** Members of the Phylum Porifera (the sponges) have individual cell types that have special jobs in the organism. Which cell type secretes the spicules?
**Answer:** Amoebocytes

**Question 4:** Cnidarians have special cells that contain organelles that produce venom. What is the name of the stinging cells?
**Answer:** Cnidocytes

**Question 5:** Which cnidarian is MIS-MATCHED with the examples of that group?
**Answer:** Anthozoa- found in a colony, Physalia, Velella (Physalia and Velella are not part of Anthozoa; they belong to Hydrozoa).

Let me know if you need any further information!