Which among the following organisms is/are not monoecious?NereisEarth wormLeechBoth A and C       The body of arthropods are divided intoHead, thorax, abdomen and tailHead, neck, thorax and abdomen Head, thorax and abdomenHead, neck, trunk and tail       The second largest animal phylum isAnnelidaArthropodaMolluscaEchinodermata       The mouth of molluscs contains a rasping organ called Radula Blastula PalliumMantle       i-b, ii-c, iii-d and iv-ai-d, ii-b, iii-a and iv-ci-d, ii-a, iii-b and iv-ci-b, ii-c, iii-a and iv-d       Which level of organization is seen in earth worms?Cell levelTissue level Organ levelOrgan system level        Which among the following is not an example of the phylum mollusca?MusselSquidTicks None of the above

The questions seem to be mixed up. Let's break them down one by one:

1. Which among the following organisms is/are not monoecious?

   • Nereis
   • Earth worm
   • Leech
   • Both A and C

2. The body of arthropods are divided into

   • Head, thorax, abdomen and tail
   • Head, neck, thorax and abdomen
   • Head, thorax and abdomen
   • Head, neck, trunk and tail

3. The second largest animal phylum is

   • Annelida
   • Arthropoda
   • Mollusca
   • Echinodermata

4. The mouth of molluscs contains a rasping organ called

   • Radula
   • Blastula
   • Pallium
   • Mantle

5. i-b, ii-c, iii-d and iv-a

   • i-d, ii-b, iii-a and iv-c
   • i-d, ii-a, iii-b and iv-c
   • i-b, ii-c, iii-a and iv-d

6. Which level of organization is seen in earth worms?

   • Cell level
   • Tissue level
   • Organ level
   • Organ system level

7. Which among the following is not an example of the phylum mollusca?

   • Mussel
   • Squid
   • Ticks
   • None of the above

Now, let's answer them:

1. Both A and C - Nereis and Leech are not monoecious, they are dioecious which means they have separate sexes.

2. Head, thorax and abdomen - The body of arthropods is typically divided into these three parts.

3. Arthropoda - This is the second largest animal phylum after Chordata.

4. Radula - This is a rasping organ found in the mouths of molluscs.

5. This question seems to be incomplete or out of context. It's not clear what the letters and numbers are referring to.

6. Organ system level - Earthworms have a high level of organization, with multiple organ systems.

7. Ticks - Ticks are not molluscs, they are arachnids, which is a class within the phylum Arthropoda.