Answer:
Cnidaria
→ Organisms have specialized stinging cells
→ Two type of body plans exist - polyp and medusa
Porifera
→ Organisms lack symmetry
→ Adult forms are sessile
→ Organisms obtain food by filtering water
→ Phenomenon of alternation of generation is observed.
Explanation:
Cnidaria, also known as the coelenterata, is a phylum of mostly marine animals having about 9,000 living species. Some of them include the corals, hydras, jellyfish, sea anemones, sea whips, etc. They possess specialized cells known as cnidocytes ( also known as “stinging cells”). These cells can seen around the mouth and tentacles cnidarian. They immobilize their prey with toxins. These Cnidaria have two body plans and which are polyp and medusa.
The phylum Porifera are known as the pore bearers. It has about 5000 species. Their adult forms are sessile. They live permanently attached to rocks. They can under alternation of generation. They possess no organs in their bodies. Also, they lack symmetry. They can be referred t as filter feeders because they obtain food by filtering water.
Answer:
a. iris
Explanation:
iris is actually the structure of the eye that regulates the amount of light passing to the visual receptors of the eye
Answer: This would affect the whole marine ecosystem. It would also effect the oxygen concentration inside the sea and in outer environment.
It contributes to a huge proportion of oxygen in the environment and if there is some sought of pollution in the sea then the aquatic animals will die and it will effect the other animals present in sea.
The marine ecosystem will be disturbed and the food web inside the sea will also be hampered.
I’m not going back to the office
2. True
3. True
4. Because they will ensure valid conclusions regarding the safety of the dam
5. Revise the hypothesis and try again
6. Ask a question
7. Revise your hypothesis and try again
8. After they have drawn a conclusion and analyzed results
9. In order to test their hypothesis
10. True
