For what resource might sessile animals compete?

Sessile animals compete for food, shelter (accommodation) and energy resources.

Explanation:

Sessile animals are stagnant animals (unable to loco mote) that fix to a place, object or other living species and take their nourishment form the surrounding or from the base to which they are attached.  

Competition arises when resources are limited. In such scenarios, a sessile animal compete for space, food, energy resources such as light etc. In case of sessile animals living in water, the major competition is for space and food only.  

the answer is b: 1.4 km/hr

the most common type of reef is the fringing reef. this type of reef grows seaward directly from the shore. they form borders along the shoreline and surrounding islands.