Soft-bodied animals that features some speices that have an external shell are called b. planarians c. annelids d. mollusks

Planarians - These are aquatic flattened-out worms (flat worms) that have a rather "primitive" aspect but also feature some very important evolutionary aspects. They do not feature shells/

Annelids - These are worm-like organisms, that live under humid conditions, and do not feature shells.

Mollusks - These also have soft bodies, like the first two, and they're also invertebrates. They feature external calcium-based shells.

Hope it helped,

BioTeacher101

what's the rest of the question

because the light is a great source of energy for the plants to survive. (i hope this )