Interestingly, echinoderms (sea stars and sea urchins) have three germ layers yet they display radial symmetry as adults rather than bilateral symmetry. it has been suggested that their immediate ancestors must have been bilaterally symmetrical and evolved radial symmetry. how can this be explained?

Glucose, also called grape sugar, blood sugar or corn sugar, is among the simplest and one of the primary naturally occurring sugars. produced naturally by plants as the primary photosynthesis product, it is heavily used by living beings as a main energy source and is necessary for cellular respiration. chemically, it is a monosaccharide carbohydrate and serves as a building block for complex sugars like starch.