The pennalean diatoms have symmetry and an elongated shape.

The answer is bilateral.

The pennalean diatoms have bilateral symmetry and an elongated shape. The pennalean diatoms have the specific shape of the cell walls. Their valves can be linear or oval with bilateral symmetry. The patterns consist of a series of transverse lines.

The virus is considered to be are living item since they have hereditary material dnas or rnas. they can imitate and change. they respond to boosts, for example, radiation, chemicals, and warmth. they have antigenic properties. they are proficient to duplicate with a same hereditary constituent.