Question

circulatory system does not exist in which of the following organisms​

Answer 1

Animals without circulatory systems: Simple animals consisting of a single cell layer, such as the (a) sponge, or only a few cell layers, such as the (b) jellyfish, do not have a circulatory system. Instead, gases, nutrients, and wastes are exchanged by diffusion.

Answer 2

Explanation:

circulatory system does not exist in microscopic organisms.