The first group of invertebrates to have a closed circulatory system are:
Correct answer: D. None of these options are correct
- A. Nematods
- B. Platyhelminthes
- C. Echinodermata
- D. None of these options are correct
Explanation
Annelids are the first group of invertebrates to have developed a closed circulatory system, and is not given as an option hence "D" is the correct answer".
Last updated
Related questions
1. Fertilization_. 2. Digestive system_.3. Excretion by_.Fill in the blanks for the organism given in the below figure:
80% of the food of sponges consists of which of the following?
80% of the food of sponges consists of which of the following?
A blue colored respiratory pigment called hemocynanin is found in:
A body cavity completely surrounded by tissue derived from the mesoderm that provides cushioning for internal organs is called