Some invertebrates combine morphological simplicity with features of great structural or biochemical complexity. Select all correct examples of this statement.

- Trematodes are acoelomates that have effective defenses against attack by their hosts' immune system.
- Sponges lack true tissues but have more variation in cell type than animals in any other phylum.
- Cnidarians are diploblasts that produce complex, capsule-like organelles.

The correct answer is -Sponges lack true tissue but have morevariation in cell type than animas in oter phylum.

Explanation:

Sponges are belong under phylum porifera which have diverse form encrusting sheets to volcano shaped mounds.

The tubes that contain in their body are differ in size from millimeter upto one meter.

The poriferans contain canal system and with help of this, they pump water which enters through a specialed pores called ostia that flows through canal called spongocoel and finally the water exits from their body through oscula.

The sponges show complex organization as their body contain single tube with 2 cell layer thick.

Ascon,leucon,sycons are the level of complexity.

the sphincter muscles at the end of the digestive tract is the anus.

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