Which of the following is not a protochordate?

Which one of the following is a protochordate

Which one of the following is a protochordate

Which one of the following is a protochordate

Which of the following is not a lyophobic sol or which of the following is a lyophilic sol?

Which of the following is/are not the products in the following reaction?

Which of the following is/are not the products in the following reaction?

In which one of the following protochordates notochord present only in the tail of larva?

Which of the following is an example of condensation polymer (or) Which of the following is not an example of addition polymer

Which of the following is an example of condensation polymer (or) Which of the following is not an example of addition polymer