Final answer:
Deuterostome development is observed in echinoderms and chordates. So, the correct options are D. echinoderms and E. chordates.
Step-by-step explanation:
Deuterostome development is seen in the animal groups:
- Echinoderms: Echinoderms are organisms like sea stars, sea urchins, and sea cucumbers. They belong to the phylum Echinodermata and show deuterostome development.
- Chordates: Chordates include vertebrates like humans, as well as two invertebrate subphyla, the urochordates and the cephalochordates. Chordates also exhibit deuterostome development.
So, the correct options are D. echinoderms and E. chordates.